Answer and Explanation: Many nuclei are radioactive, which means they emit particles to become stable. In the process, they also become a different element. There are 3 types of decay:
Alpha decay: it emits a particle of Helium, i.e., emits a particle with 2 as atomic number (Z) and 4 as atomic mass (A);Beta decay: emits an electron: a particle with 0 mass and -1 as atomic number;Gamma decay: emits a high energy form of electromagnetic radiation and it is extremely dangerous and penetrating;Problem #1:
1.) Astatine: Z = 85 and A = 211
Alpha decay: [tex]{{A=211} \atop {Z=85}} \right. At[/tex] ⇒ [tex]{{207} \atop {83}} \right. Bi + {{4} \atop {2}} \right. \alpha[/tex]
The isotope created is Bismuth
Characteristics: Z = 83; e⁻ = 83; n = A - Z = 207 - 83 = 124
The isotope is Bismuth with 83 protons, 83 electrons and 124 neutrons.
Problem #2
1.) Lead: Z = 82 and A = 82
Beta decay: [tex]{{209} \atop {82}} \right. Pb[/tex] ⇒ [tex]{{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta[/tex]
The isotope created is talium.
2.) [tex]{{209} \atop {82}} \right. Pb[/tex] ⇒ [tex]{{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta[/tex]
[tex]{{209} \atop {81}} \right. Tl[/tex] ⇒ [tex]{{205} \atop {79}} \right. Au+{{4} \atop {2}} \right. \alpha[/tex]
[tex]{{205} \atop {79}} \right. Au[/tex] ⇒ [tex]{{205} \atop {78}} \right. Pt+{{0} \atop {-1}} \right. \beta[/tex]
3.) The isotope created is [tex]{{205} \atop {78}} \right. Pt[/tex].
p⁺ = 78; e⁻ = 78; n = 127
The isotope created ahs 78 protons, 78 electrons and 127 neutrons.
How many lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO3-)?
Answer: 8
Explanation: just took the mastery test
The formation of molecule can easily be shown by drawing Lewis dot structure. Since atom's Lewis dot structure has three dots. Therefore, eight lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO₃⁻).
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.
3 oxygen (O) atoms and a nitrogen (N) atoms make up basic Lewis dot of a nitrate [NO₃]⁻ ion. The molecular ion has a nitrogen (N) atom in its core and three oxygen (O) atoms, one on each side, at terminal positions.
Therefore, eight lone pairs of electrons are represented in the Lewis structure of a nitrate ion (NO₃⁻).
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A certain atom has a nucleus containing six protons and eight neutrons and has six electrons orbiting the nucleus. This atom is a form of the element — ¡silicon ¡carbon ¡magnesium ¡calcium
Answer:
Carbon
Explanation:
The way to identify an element is by looking at the number of protons the atom has. Every element has its own atomic number. This atom has 6 protons. If you look at the periodic table, you can see that the atom with the atomic number of 6 is carbon.
As the atom has six protons in it's nucleus, the atom is a form of element of carbon.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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Write in standard notation 6.078 x 10 expo 3
Answer:
6078
Explanation:
What is the formal charge of i in icl4
Answer:
Explanation:
in the Lewis structure of ICl4- there are total of 36 valence electrons. Since Iodine (I) is below Period 3 on the periodic table it can hold more than 8 electrons. ... Also note that you should put the ICl4- Lewis structure in brackets with as 1- on the outside to show that it is an ion with a negative one charge.
The formal charge present on the iodine atom of ICl₄ is -1.
How do we calculate formal charge?Formal charge on any atom present in any compound will be calculated by using the below formula:
Formal Charge = (No. of valence electrons in neutral atom) - 1/2 (No. of electrons in covalent bond) - (No. of electrons in lone pair)
In the structure of ICl₄, 4 covalent bonds are present and for iodine atom no. of valence electrons in iodine is 7 and lone pair present on iodine is 2 means 4 electrons of lone pair is present. Structure is shown in the attached image.
On putting these values we get,
Formal charge = 7 - 1/2(8) - 4 = -1
Hence in iodine atom -1 charge is present.
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The public is not yet able to purchase cars powered by hydrogen fuel cells because engineers have to determine how the cars perform based on which scenario? on racetracks in real-world conditions in flooded environments on closed courses
A(on racetracks
B(in real-world conditions
C(in flooded environments
D(on closed courses
Answer:
It’s B just did it
Explanation:
Answer:
B.
Explanation: i just tookthe quiz ya welcome.
Which event occurs during high tide? Al of Earth's ocean levels rise. The moon's orbit is closer to Earth The moon's gravity causes Earth's crust and water to bulge. Earth's crust and water are being pulled in opposite directions by the Sun and moon.
Answer: B. the moon's orbit is closer to the earth.
Explanation: I took the test
Answer:
B The moon’s orbit is closer to Earth.
Explanation:
I took the test on Edge :)
Examine the data table below. Most adult sparrows have a wing span falling into which of the following ranges?
Adult Sparrows Measured
Answer:
19-24 cm
Explanation:
Answer:
the answer is 19-24 cm
Explanation:
i did the study island
how do you find molecules????? asap please!!!
Please help, urgent!! Will give extra points, thank you so much!!
Answer:
1.proton
2.nucleus
3. electrons
4.nucleus??
5. protons and neutrons
6. electrons
7.neutrons
Explanation:
22. Write a balanced equation for each of the following reactions.
b) Magnesium metal with steam.
Answer:
2Mg(s) + O2(g) - >2MgO(s)
In DNA replication, what is the leading strand? A. the strand that is unzipped at the replication fork B. the strand that assembles new nucleotides in a continuous fashion C. the strand that does not assemble new nucleotides in a continuous fashion D. the strand that waits for the DNA replication process to be finished
Answer:
B
Explanation:
Answer: B.) the strand that assembles new nucleotides in a continuous fashion
Explanation: edgenuity
Behold a mixture of oily/hydrophobic (yellow) and water (purplish) molecules. recall that hydrophobic regions are ones with few or no partial charges--so there's nothing for water's hydrogen interaction donors or acceptors to 'play with'. so! how many of the water molecules are 'stuck' contacting at least part of a hydrophobic molecule in this arrangement?
Answer:
about 40
Explanation:
In the attached diagram, there are 5 hydrophobic molecules show, each of which has 9 water molecules shown around it. There are "about 40" water molecules 'stuck' to the hydrophobic molecules.
Given the reaction for the nickel-cadmium battery: 2NiOOH + Cd +2H2O -> 2Ni(OH)2 + Cd(OH)2 What species is oxidized during the discharge of the battery?
Answer:
Cd is oxidized during the discharge of the battery
Explanation:
Based on the reaction:
2 NiOOH + Cd + 2H₂O → 2Ni(OH)₂ + Cd(OH)₂
And knowing Oxygen and hydrogen never change its charge, we must to find oxidation state of Ni and Cd before and after the reaction:
Ni:
In NiOOH: 2 O = -2*2 = -4 + 1H = +1, = -4 + 1 = -3. And as the molecule is neutral, Ni is 3+
In Ni(OH)₂: OH = -1. As there are 2 OH = -2. That means Ni is +2
The Ni is gaining one electron, that means is been reduced
Cd:
Cd before reaction is as pure solid with oxidation state = 0
Cd after the reaction is as Cd(OH)₂: 2 OH = -2. That means Cd is +2
The Cd is loosing 2 electrons, that means is the species that is oxidized.
If the density of a set of keys is 8 g/cm', what is the volume if its mass is 54 g?
a.432 mL
b. 6.75 mL
c. 432 g
d. 0.148 mL
Answer:
the volume of a set of keys is 6.75ml
Which question cannot be answered by science? (4 points)
a
Why do rainbows appear after rain storms?
b
Which plants grow in the desert?
c
Why should endangered animals be protected?
d
What is the hardest element on Earth?
Answer:
C
Explanation:
The option C question has not a specific answer related to pure science.
The question cannot be answered by science is Why should endangered animals be protected? . Option C is correct.
What are endangered animals?An endangered species or the animals or plants which are at the risk of the extinction is a type of organism or animal or plant that is threatened by extinction.
Species of some animals and plants become endangered for two main reasons first one is loss of habitat or living due to destruction of forest and loss of genetic variation due to some evolution. An species is a type of organism or plant or animal that is threatened by extinction.
Therefore, question cannot be answered by science is Why should endangered animals be protected? . Option C is correct.
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Is 500mL greater than 5L
What is the first step in cell division?
Answer:
prophase,
Explanation:
during which the nucleus dissolves and the chromosomes begin migration to the midline of the cell.
The first step of cell division is known as prophase, during which the nucleus dissolves and the chromosomes start the migration to the cell.
What is cell division?Cell division can be described as the process by which a parent cell divides into two daughter cells. Cell division takes place as part of a cell cycle in which the cell grows and replicates chromosome(s) before dividing.
In eukaryotes, there are two types of cell division: a vegetative division (mitosis), producing daughter cells genetically similar to the parent cell, and a cell division that forms haploid gametes for sexual reproduction (meiosis), decreasing the number of chromosomes from two of each kind in the diploid parent cell to one of each kind in the daughter cells.
The phases of cell division are interphase, Prophase, Metaphase, Anaphase, Telophase, and Cytokinesis.
In the Prophase, the nuclear envelope will be broken down and chromatin condenses to produce shorter more visible strands known as chromosomes.
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Which of the following is not likely to appear on a map?
A. Remote sensors
B. compass rose
C. contour lines
D. latitude lines
E. the equator
Hey student made a model of a river in a sandbox a pile of sand represents soil and bits of rocks in the riverbed water pouring from 100% river water as it flows downhill which two characteristics are limitations of the students model
Answer:
The model is missing plants, fish and other details found in a real river
The model is much smaller then a real river
Explanation:
Answer:
The model is missing plants, fish and other details found in a real river
The model is much smaller then a real river
Explanation:
Which of the following means a natural occurring solid that has a specific chemical makeup?
A. Rock
B. Mineral
C. Erosion
Answer:
mineral
Explanation:
Because every natural thing has mineral
How can a new element be made?
Answer:
You have to change the number of protons in the nucleus. While it is possible, it requires bombarding and putting together elements, which creates high energy particle accelerators.
what are the formulas?
Explanation:
Answer 1-4
1. Cr(NO2)3
2. AlCl3
3. Na2CO3
4. Ba(OH)2
How to prevent environmental hazards?
Answer:
by throwing away or recycle
Explanation:
In the reaction glucose + fructose → sucrose + water, __________ is a reactant and __________ is a product.
Answer:
glucose + fructose is a reactant, sucrose + water is a product
Explanation:
The first part of the equation is a reactant(s), and the other part of the equation is the product(s).
Round 1047.78 to three sig figs
105
1048
1050.00 and 1050 PLEASE HELP
Answer:
105
Explanation:
round 104 to the nearest whole number...since 7 is greater than 5 4 goes up..but if 7 is less than 5,4 remains the same
why do living things need water, food, and space
living thing need water to survive
and food to get energy and perform life processes.
and living organism need space to gets the energy and materials it needs
Which is more important in a chemical formula, the symbol or the subscript or both?
Answer:
The symbol is more important in a chemical formula
Explanation:
Rank the nonmetals in each set from most reactive (1) to least reactive (3).
Neon:
Selenium:
Fluorine:
Answer:
Neon: 3
Selenium: 2
Fluorine: 1
Explanation: The periodic trend of reactivity depends on whether the elements are metals or nonmetals.
Answer:
Neon:
3
Selenium:
2
Fluorine:
1
Explanation:
Just got them correct on Edge.
Why doesn’t the temperature of an object constantly rise as you add more and more kinetic energy?
What are the favourable condition
the formation of ionic bond?
for
Answer: Favourable conditions for the formation of ionic bond are low ionization energy of metal and high electronegativity of non-metal.
Explanation: An ionic bond is defined as the bond formed due to transfer of one or more number of electrons from one atom to another.
Answer: Favourable conditions for the formation of ionic bond are low ionization energy of metal and high electronegativity of non-metal. Explanation: An ionic bond is defined as the bond formed due to transfer of one or more number of electrons from one atom to another
hope this helps, sorry if im off