A phase change is a physical change involves no bond making or breaking. The heat energy is used to weaken the intermolecular forces of attraction and moves the molecules apart. Thus option C and D are correct.
What is a phase change?A phase change is the change in phase or state of the substance. For example, solid to liquid, liquid to gas conversions etc. are phase changes.
During a phase change, no chemical bond is breaked or maked but the intermolecular force of attraction holding the molecules together weakens and moves the molecules apart.
Consider the phase change of solid to liquid. The closely packed molecules in solid uses heat energy to to move apart by weakening the intermolecular force and form the liquid state.
Therefore, during a phase change, heat is used to weaken or break the intermolecular force and increasing movement of particles. Thus options C and D are correct.
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A student made the following observations about an unknown sample. Property observation color light yellow texture viscous liquid mass 3. 8 g density 1. 44 g/cm³ which of these observations describes an extensive property of the material?.
Among the observations, the mass, which is 3.8 g, describes an extensive property of the material.
Physical properties of a material can be classified as either intensive property or extensive property.
Intensive properties of a material are the properties that do not change no matter how much amount the material changes. On the other hand, extensive properties of a material are the properties that change as the amount of material changes.
Among the given observations, color, texture, and density are all intensive properties. If the unknown sample is increased, these properties will not change.
But when the sample is increased or reduced, the mass will change. Hence, the only extensive property among the observations is the mass.
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40. Write electron configurations for the elements
that are identified by these atomic numbers:
a. 7
b. 9
c. 12
d. 36
Electron configurations for the elements follow 3 principles , Aufbau principle, Pauli Exclusion Principle and Hund's Rule of Multiplicity
What is Aufbau principle ?
It states that electrons fill lower-energy atomic orbitals before filling higher-energy ones.
The order in which the orbitals are filled with electrons are:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p
Element with electronic configuration of atomic number:
a. 7 is Nitrogen : 1s2 2s2 2p3 or [He] 2s2 2p3
b. 9 is Fluorine : 1s2 2s2 2p5 or [He] 2s2 2p5
c. 12 is Magnesium : 1s2 2s2 2p6 3s2 or [Ne] 3s2
d. 36 is Krypton : 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 or [Ar] 4s2 3d10 4p6
Thus we can conclude that electron configurations for the elements follow 3 principles , Aufbau principle, Pauli Exclusion Principle and Hund's Rule of Multiplicity
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The Sierra Nevada, a mountain range in California, is made largely of intrusive rock that was formed underground.Which process explains why rock that formed underground is now aboveground in the Sierra Nevada?
A.It was pushed upward by natural geologic processes.
B.It was left above the surface as the land around it sank.
C.It was weathered by the pressure from surrounding rock.
D.It was moved to the surface by volcanic eruptions
Answer: To me i think it’s “A” because one of the geological processes is
hydrothermal process which I think is also cooling down
If you dive 66 ft underwater you will experience a pressure of 3.00 atmosphere. What is this in kilopascal?
If we are to express the pressure of the gas in kilopaschal then we have 303.9 kPa
What is pressure?We define the pressure of the gas as the force with which the gas is able to bump or hit or collide against the walls of the container in which the gas has been stored. In this case, we have been given the pressure of the gas but the unit in which the volume have been given is the unit of the atmosphere and we are asked by the question to express the pressure in the unit of kilopascal.
We know that from the use of the conversion factors;
1 atm = 101.3 kPa
3 atm = 3 atm * 101.3 kPa/ 1 atm
= 303.9 kPa
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The atomic number of an element:
Question options:
Tells you the mass of the atom
Tells you the number of energy levels there are around the atom
Tells you the identity of the atom
Tells you how many valence electrons the atom has
Answer:tells you the identity of the atom
Explanation:
number of protons=atomic number
Answer: C
Explanation: The answer would be C, it tells you the identity of the atom.
Which atom has the largest number of neutrons?
a. silicon-30
b. sulfur-36
c. argon-39
d. calcium-40
Answer:
Sulfur has the most neutrons (it has 4).
an elephant of mass 500kg stands on the ground.each foot has an area of 0.08m2.calculate the pressure exerted on the ground.g=10m/s2.
If an elephant of mass 500kg stands on the ground, each foot has an area of 0.08m2, the pressure exerted on ground is 15,625 Pa.
What is pressure?In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a point within a confined fluid. A 42-pound box with a bottom area of 84 square inches will press down on a surface with a pressure equal to the force divided by the area over which it is applied, or half a pound per square inch.
Atmospheric pressure, which at sea level is roughly 15 pounds per square inch, is the weight of the atmosphere pressing down on each unit area of the Earth's surface. One pascal is equal to one newton per square meter when expressed in SI units, which is how pressure is calculated. Nearly 100,000 pascals of atmospheric pressure are present.
We have given that mass is 500kg and area of each leg is 0.08m²
The formula for Pressure is
Pressure = Force/Area
Let us find the weight first
⇒ weight = mass × g
= 500kg × 10N/kg
= 5000N
Total contact area = 0.08m² × 4
= 0.32m²
Finally, we will calculate the pressure
⇒ Pressure = Force/Area
= 5000N/0.32m²
= 15625 Pa
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What is the mass required to make a 311 mL of 7.5M NaCl solution?
Answer:
[tex]136.31\text{ g}[/tex]Explanation:
Here, we want to get the mass required to make the given volume
To get this we need to get the number of moles
To get the number of moles, we have to multiply the volume by the molarity
Mathematically, we have that as:
[tex]\begin{gathered} number\text{ of moles = volume }\times\text{ molarity} \\ \end{gathered}[/tex]The volume can be converted to liters by dividing by 1000
So we have the volume as 311/1000 = 0.311 L
Thus, we have the number of moles as:
[tex]number\text{ of moles = 0.311 }\times\text{ 7.5 = 2.3325 moles}[/tex]To get the mass, we have to multiply the number of moles by the molar mass
The molar mass of NaCl is 58.44 g/mol
Thus, we have the mass as:
[tex]2.3325\text{ }\times\text{ 58.44= 136.31 g}[/tex]mesitylene is a liquid hydrocarbon. burning 0.115 g of the compound in oxygen gives 0.379 g of co2 and 0.1035 g of h2o. what is the empirical formula of mesitylene?'
The empirical formula of mesitylene is C₃H₄.
To solve this problem, we need to determine the molar ratio of carbon and hydrogen in mesitylene. We can do this by first calculating the masses of carbon and hydrogen in the sample. Because all the carbon in mesitylene is transformed into carbon dioxide, the mass of carbon in CO₂ will be equal to the mass of carbon in the mesitylene. All we need is the molar mass of carbon dioxide: 44 g/mol
12 g of carbon : 44 g of carbon dioxide = X : 0.379 g of carbon dioxide
X = 12 g of carbon * 0.379 of carbon dioxide / 44 g of carbon dioxide
X = 0.103 g of carbon
Because mesitylene is composed of just carbon and hydrogen, we can determine the mass of hydrogen by subtracting the mass of carbon from the mass of mesitylene:
0.115 g - 0.103 g = 0.012 g of hydrogen
Now we divide these masses by the molar masses of the elements:
0.103 g / 12 g/mol =0.009 mol of carbon
0.012 g / 1 g/mol = 0.012 mol of hydrogen
We divide the moles by the smaller of the two numbers to get the molar ratio:
0.009 mol / 0.009 mol = 1 for carbon
0.012 mol / 0.009 mol = 1.33 for hydrogen
Because we need the molar ratio to be in integers, we multiply both values by 3:
1 * 3 = 3 for carbon
1.33 * 3 = 4 for hydrogen
This means that the empirical formula of mesitylene is C₃H₄.
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A chemist makes 770. mL of barium chloride (BaCl₂) working solution by adding distilled water to 50.0 mL of a 1.74 Mstock solution of barium chloride in water.Calculate the concentration of the chemist's working solution. Round your answer to 3 significant digits.MX5 ?
Answer
0.113 M
Explanation
Given that:
The volume of the stock solution, V₁ = 50.0 mL
The concentration of the stock solution, C₁ = 1.74 M
The volume of the solution the chemist made, V₂ = 770.0 mL
What to find:
The concentration (C₂) of the BaCl₂ solution the chemist made.
Step-by-step solution:
The concentration (C₂) of the chemist's working solution can be calculated using the dilution formula below:
[tex]\begin{gathered} C_1V_1=C_2V_2 \\ \\ C_2=\frac{C_1V_1}{V_2}=\frac{1.74M\times50.0mL}{770.0mL} \\ \\ C_2=\frac{87M}{770.0} \\ \\ C_2=0.113M \end{gathered}[/tex]Hence, the concentration of the chemist's working solution is 0.113 M.
The group that fits neatly onto the end of the table, the
____ are unwilling to react with other elements
O alkaline earth metals
O halogens
O noble gases
O alkali
13.0 mol 3.0 mol methanegasand oxygengas react to form carbon dioxide gas and watervapor. suppose you have of and of in a reactor. suppose as much as possible of the reacts. how much will be left? round your answer to the nearest
The no. of moles of [tex]CH_4[/tex] remaining after the reaction is found to be 11.5 moles.
The no. of moles of a material equals the ratio of its given mass to the mass of one mole of that molecule in a chemical reaction.
The coefficients reflect the number of moles, not simply molecules, that react.
Stoichiometric coefficients are the numbers that come before the chemical formula of a molecule participating in a reaction. They assist us in determining the relative amounts or no. of moles of each reactant consumed and product created during a reaction.
[tex]CH_4 (g) + 2O_2 (g) \rightarrow CO_2 (g) + 2H_2O (g)[/tex]
No. of moles of [tex]CH_4[/tex] = 13.0 mol
No. of moles of [tex]O_2[/tex] = 3.0 mol
Here [tex]O_2[/tex] is limiting reagent because moles of [tex]O_2[/tex] is less.
Thus, [tex]CH_4[/tex] is in excess
1 mol [tex]CH_4[/tex] = 2 mol [tex]O_2[/tex]
x mol [tex]CH_4[/tex] = 3 mol [tex]O_2[/tex]
Moles of [tex]CH_4[/tex] used = 3 x 1 / 2 = 1.5 mol
Here we have 13 moles of [tex]CH_4[/tex],
Therefore,
No. of moles of [tex]CH_4[/tex] left = 13 - 1.5 = 11.5
Result:
11.5 moles of [tex]CH_4[/tex] will remain after the reaction.
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HELP ASAP WILL MARK BRAINLIEST
Consider the reaction:
A + 3B → 2C
How does the reaction rate of B compare to the reaction rate of C?
A The rate of B is -½ the rate of C.
B The rate of B is -3/2 the rate of C.
C The rate of B is -⅔ the rate of C.
D The rate of B is -⅓ the rate of C.
To solve this we need to have knowledge of differential rate law which relate the rate to the concentration and time The option B is correct option.
What is differential rate law?A differential rate law represents the rate of a reaction . According to this rate is directly proportional to changes in the concentration of reactants and inversely proportional to specific interval of time. There is another expression of rate law which is integrated rate law which is just opposite of differential rate law
The given equation is
[tex]A+3B\rightarrow2C[/tex]
Rate of B= rate of C
[tex]\frac{1}{3}d\frac{[B]}{dt} =\frac{1}{2}d\frac{[C]}{dt}[/tex]
[tex]d\frac{[B]}{dt} =\frac{3}{2}d\frac{[C]}{dt}[/tex]
Thus option B is correct option.
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The model shows the first three periods of the Periodic Table. Which statement BEST describes the trend in the number of protons and valence electrons across a period?
A. Across a period, elements gain a proton and lose a valence electron.
B. Across a period, elements gain a proton and gain a valence electron.
C. Across a period, elements lose a proton and gain a valence electron.
D. Across a period, elements lose a proton and lose a valence electron.
Moving across the period the elements gain a proton and gain a valence electron.
What is an element and why elements gain proton across the period?An element is the building block of inorganic chemistry , the basic fundamental unit of compounds.There are total of 118 elements discovered yet , out of which the 118th element is orgasson.Moving across the period that is from left to right the size of element decreases because of the addition of protons.Moving across the period the nucleus have increased capacity of attraction.With increase in the positive charge the nucleus gains a proton and a valence electron.To know more about periodic table visit:
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To eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied by before adding the equations together?
First Equation: 5x − 4y = 28
Second equation: 3x - 9y = 30
The first equation should be multiplied by 3 and the second equation by 5.
The first equation should be multiplied by 3 and the second equation by −5.
The first equation should be multiplied by 9 and the second equation by 4.
The first equation should be multiplied by 9 and the second equation by −4.
Answer: the answer is D) The first equation should be multiplied by 9 and the second equation by −4.
Explanation:edge 2022
12 g of carbon are combusted (burnt) in 32 g of oxygen to give carbon dioxide.
The amount of CO₂ formed is 44g.
The chemical reaction occurs is C+O₂=CO₂.
We know that 1mol of carbon and 2 oxygen reacts together to form 1mol of CO₂.
According to law of conservation of mass the total mass of the products formed in chemical reaction must be equal to the mass of reactants consumed.
So, the amount of CO₂ produced is 1mol of CO₂ is 44g, which is equal to it’s molecular weight.
According to the law of conservation of mass, mass is neither generated nor destroyed during a chemical process. For instance, when coal is burned, the carbon atom in it transforms into carbon dioxide. The carbon atom transforms from a solid to a gas, yet its mass remains constant.
CO₂ gas has no color or smell. The gas is not combustible. It has a mild toxicity. Denser than air, it. It is soluble in water, and as temperature rises, solubility decreases.
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what is the predominant intermolecular force in the liquid state of each of these compounds: hydrogen fluoride ( hf ), carbon tetrachloride ( ccl4 ), and methyl chloride ( ch3cl )?
The intermolecular forces in HF, [tex]CCl_4[/tex] and [tex]CH_3Cl[/tex] molecules are hydrogen bonding, dispersion forces and dipole-dipole interactions respectively.
Intermolecular forces, such as the electromagnetic forces of attraction or repulsion that act between atoms in a molecule and other kinds of nearby particles, such as atoms or ions, mediate interactions between molecules.
The attractive forces that occur between molecules are known as intermolecular forces. They control a number of bulk characteristics, including the solubilities (miscibilities) of compounds and their melting and boiling temperatures.
Intermolecular forces may be divided into four categories: hydrogen bonding, London dispersion forces, ion-dipole, and dipole-dipole.
HF has a hydrogen bond, also known as an H-bond, is an electrically charged attraction between an electronegative atom containing a single pair of electrons, known as the hydrogen bond acceptor, and a hydrogen (H) atom that is covalently attached to a more electronegative "donor" atom or group.
[tex]CCl_4[/tex] has London dispersion forces which is the least powerful intermolecular force. When the electrons in two nearby atoms hold positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive attraction.
[tex]CH_3Cl[/tex] has dipole-dipole interactions where molecules having permanent dipoles are drawn to one another electrostatically; for example, the positive end of one molecule will attract the negative end of another, and so forth, eventually causing the molecules to align.
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a 2.50-mole quantity of nocl was initially in a 1.50-l reaction chamber at 400°c. after equilibrium was established, it was found that 28.0 percent of the nocl had dissociated: 2nocl(g) δ 2no(g) 1 cl2(g)
0.0351mol/L is the equilibrium constant, Kc of the given chemical reaction.
The value of a chemical reaction's reaction quotient at chemical equilibrium, a condition that a dynamic chemical system approaches when enough time has passed and at which its composition has no discernible tendency to change further, is the equilibrium constant for that reaction.
Given:
Initial no. of moles of NOCl = 2.5 moles
NOCl dissociated = 28%
total volume = 1.5 L
To find:
Equilibrium constant, Kc = ?
Formula:
Kc = [products] / [reactants]
Calculations:
(28/100) x 2.5 = 0.7 moles
[tex]2NOCl (g) \leftrightarrow 2NO (g) + Cl_2 (g)[/tex]
According to the above equation,
2 moles of NOCl will give 1 mole of [tex]Cl_2[/tex] and 2 moles of NO
Therefore, no. of moles of NO = 0.7 mol
No. of moles of [tex]Cl_2[/tex] = 0.35 mol
No. of moles of NOCl remaining after dissociation = 2.5 - 0.7 =1.8 mol
Molarity = no. of moles / volume
Therefore, Molarity of NO = 0.7 / 1.5 = 0.466M
Molarity of [tex]Cl_2[/tex] = 0.35 / 1.5 = 0.233M
Molarity of NOCl = 1.8 / 1.5 = 1.2M
Kc = [tex]([NO]^2 [Cl_2]) / [NOCL]^2[/tex]
Kc = [tex][(0.466)^2 (0.233)] / (1.2)^2[/tex]
Kc = 0.0351mol/L
Result:
The equilibrium constant, Kc of the given chemical reaction is found to be 0.0351mol/L.
The complete question is:
A 2.50 mol quantity of NOCl was initially in a 1.50L reaction chamber at 400℃. After equilibrium was established it was found that 28.0% of NOCl had dissociated.
[tex]2NOCl (g) \leftrightarrow 2NO (g) + Cl_2 (g)[/tex]
Calculate equilibrium constant Kc for the reaction.
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cfc-11 has a global warming potential (gwp) of 4750. the current global mean concentration of cfc-11 is approximately 220ppt. calculate, relative to co2, the percentage of warming attributed to cfc-11.
The relative contribution of CO2 attributed to global warming is 60 % in the environment.
What is global warming , responsible gases and percentage attributed from these gases?The decrease in the amount of sunlight due the increasing CO2 and air pollutant in the atmosphere absorbing sunlight is owing to global warming.Global warming is caused by gases such as CO2, CH4, and lots of air pollutants.Global warming is causing great harm to the natural atmosphere and effecting the plant growth too.The relative concentration of CO2 attributed to global warming is 60% of the total.And cfc -11 is the chloroflorocarbons responsible for increasing global warming effects.To know more about global warming visit:
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The space probe Pioneer 11 was launched April 5, 1973, reached Jupiter, over 980 million km away, in December 1974, and continued on into inter-solar space. How long did it take an
electromagnetic signal to travel to earth from Pioneer 11 when it was at a point 1086 million km from the earth?
Pioneer 11 launched and touched down one year later. It travelled there in 606 days, flying by Jupiter at a considerably closer distance (21,000 kilometres), and also stopped by Saturn.
What did Pioneer 11 set out to accomplish?Pioneer 11 was the second spacecraft in early human exploration of the outer solar system and the first mission to investigate Saturn. Instruments were carried by the spacecraft to investigate magnetic fields, the solar wind, and the atmospheres, moons, and other features of Jupiter and Saturn.
The gravity of Jupiter assisted Pioneer 11 as it rocketed toward Saturn. The spaceship had to travel nearly five years to reach the planet, which was 930 million miles away from Earth.
When the final message from the spacecraft was received on September 30, 1995, the Pioneer 11 Mission came to a conclusion. Since then, Pioneer 11 has not been in contact.
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35.Pure water (H2O) can be placed in which of the following classes of matter?Select one:a. Compoundsb. Elementsc. Mixturesd. Solutions
ANSWER
Water molecule is a compound
EXPLANATION;
Water molecule is formed from the combination of oxygen and hydrogen atoms
[tex]\text{ 2H}_2\text{ + O}_2\text{ }\rightarrow\text{ 2H}_2O[/tex]Recall, that compound is the combination of two or more elements that are chemically combined together
Therefore, water molecule is a compound
Which of the following substances contain an alkali?
A ball of mass 1 kg is dropped from a height of 3 m. Assume no air resistance. After it bounces off the ground it only reaches a height of 2 m. What is the change in momentum of the before and after the bounce?.
A 1 kg ball is thrown from a height of 3 m.Without considering air resistance. The height it reaches after it bounces off the ground is only 2 metres.The change in momentum of the before and after the bounce is -1.407 kgm/s.
This can be calculated as,
Change in momentum = m ( vf-mvi)
29.4 = 1/2mvi2
vf = 7.668m/s
19.6J = 1/2vf
2vf = 6.261m/s
Change in momentum = m(vf-vi)
= 1kg x (-1.407m/s)
= -1.407 kgm/s
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ELEMENT #1
The radius of my most common ion is smaller than my atomic radius.
My valence shell contains only s-orbital electrons.
I form an ion with a 2+ charge.
I have a lower first ionization energy than calcium.
I have a smaller atomic radius than barium.
What element am I? Write my symbol and electron configuration using shorthand notation.
*dont have to give me the shorthand notation at all i can find it
The element that have been described in the question above is Strontium.
What is the first ionization energy?The term first ionization energy refers to the energy that is required in order to remove the first electron from the valance shell of an atom. We know that the first ionization energy of an atom depends on some factors such as the proximity of the outermost shell to the nucleus of atom.
As such, the element that is being discussed here is the strontium atom. It has a lower first ionization energy than calcium and a smaller atomic radius than barium.
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What are the products from the following reactants: Na₂O + Ca →
A. CaO + Na
B.Ca₂O + Na₂
C.CaO₂ + Na
D. CaO + Na₂
please help
The image shows Mary happily swinging in the park. There are tree positions shown in the image: A, B, and C. PositionB is located at the very bottom of the swing arc and has the lowest height. Which of the following equations best describes the energy at point C, assuming energy is conserved?
Equation B. PEa = KEc + PEc best describes the energy at point C, assuming energy is conserved.
As we are provided,
Three particular points A,B and C are described.
The point A is the point at the top, the point B is the point at the bottom and point C is the point somewhere in the middles when merry is swinging.
According to law of conservation of energy,
The sum of total energy is conserved at every point of the motion.
As point A is the highest point. The body will come at momentary rest. The whole of energy will be stored as the potential energy of the girl.
At point B, the swing will have maximum velocity and the whole energy will be found in the form of kinetic energy.
At point C, the total energy will be a sum of potential plus kinetic energy.
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The image shows Mary happily swinging in the park. There are tree positions shown in the image: A, B, and C. PositionB is located at the very bottom of the swing arc and has the lowest height. Which of the following equations best describes the energy at point C, assuming energy is conserved?
A. PEa= KEc
B. PEa= KEc + PEc
C. PEg= KEc + PEc
D. PEg = PEc
An atom is made up of subatomic particles and has an overall neutral charge. Which two subatomic
particles must be equal for the atom to have the overall neutral charge?
Answer: Protons and Electrons
Explanation:
Atoms are made up of 3 subatomic particles.
Protons (Positive Charge)
Electrons (Negative Charge)
Neutrons (Neutral Charge)
The number of protons must be equal to that of electrons in order for the overall charge to be neutral.
A sodium atom has three energy levels. How many energy levels do you predict atoms of argon, aluminum, and chlorine have?
PLEASE HELP
The energy levels present in argon, aluminum and chlorine is 3 , with two electrons on the first energy level , 8 in the second level and third level have 8 electrons of argon.
What is an energy level and how many are present in argon, aluminum, and chlorine?Energy level is the level which is denoted by K,L,M,N and these energy levels are filled with electrons.Aluminum is an element of p block , thirteen group , so the energy levels present in aluminum is 3 .Argon is a noble gas element in the 18th group of the periodic table , with three energy level.Chlorine is an element of halogen group in which the valence number of electron is 7 the maximum with chlorine having three energy level.The less the number of energy level the more the attraction and the less is the stability.To know more about energy levels visit:
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1. What is conductivity? How can electrical conductivity be measured?
2. What does an electrical conductivity probe consist of?
3.
4.
How does an electrical conductivity probe work?
What is current flowing through the water proportional to?
5. What happens when there is a higher dissolved salt/ion concentration?
6. What is an electrolyte?
The ability of an electric charge or heat to move through a material is measured by its conductivity. A material is considered a conductor if it offers relatively minimal resistance to the flow of thermal or electric energy.
What is electrical conductivity?Either the 2-AC bipolar approach or the electromagnetic induction method can be used to test conductivity. The current that travels through the solution between two electrodes is measured using the bipolar technique. Two coils submerged in the solution produce an induction current, which is measured by the electromagnetic induction technique. The ability of an electric charge or heat to move through a material is measured by its conductivity. A material is considered a conductor if it offers relatively minimal resistance to the flow of thermal or electric energy. Metals, semiconductors, and insulators are the three categories of materials.For both quality assurance and control during production, electrical conductivity monitoring is used. It is specifically used to assess a material's ability to conduct an electrical current.To learn more about : Conductivity.
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The half-life of colbalt-60 is 5.3 years. What percent of a colbalt-60 sample remains after 10.6 years
After one half life, the number of years needed for 1/4 of the cobalt-60 to remain after decay is computed as follows.
After another half life, only 1/4 of the original mass isotope is left; consequently, if one half life is 5.3 years, the number of years needed is 2 x 5.3 years, or 10.6 years.
What is an isotope ?A chemical element's isotope is any of two or more species of atoms that share the same atomic number, position in the periodic table, and virtually identical chemical behavior, but differ in atomic mass and physical characteristics. There are one or more isotopes for each chemical element.The sum of the protons and neutrons in an isotope's mass is what distinguishes it from another isotope. Isotopes are often written in one of two ways. Both use the atom's mass, which is calculated as mass = (number of protons) + (number of neutrons).
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