2. Which set of symbols represents isotopes of the same element?
Set 2
Set 1
80
м
38
133
81
M
38
83
M
38
132
Q
55
Q
133
Q
54
55
Set 4
Set 3
50
L
19
50
L
20
50
L
21
91
J
43
92
J
42
93
J
42

Answers

Answer 1

The set of symbols that represents isotopes has been 84/38 M 86/38 M 87/38 M. Thus, option D is correct.

The isotopes are the elements with same atomic number, but different mass number. In an isotope [tex]\rm ^a_bX[/tex], a has been the atomic mass, and b has been the atomic number.

The isotopes will have same value for b, while different values for a.

In the following given sets:

A. 50/19 L 50/20 L 50/21 L

It has same number of mass the atomic number has been different. Thus, the set not represents isotopes.

B. 138/59 Q 133/55 Q 133/54 Q

The given elements, has different atomic number, and different mass number. Thus the set did not represents the isotopes.

C. 91/42 J 92/42 J 93/40 J

The given elements, has different atomic number, and different mass number.Thus the set did not represents the isotopes.

D. 84/38 M 86/38 M 87/38 M

The given set has same atomic number with different mass number.Thus, the set has been the representation of isotopes.

The set of symbols that represents isotopes has been 84/38 M 86/38 M 87/38 M. Thus, option D is correct.

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Related Questions

which compound forms 2 parts of hydrogen and 1 part of oxygen?

Answers

Answer:

water

for one molecule of water each atom has the atomic mass unit, u,shown.

Explanation:

*can i be the brainliest*

Question 26 (1 point)
Use the periodic table to determine which statement below is true of the element Bromine (Br).

•Bromine will lose 7 valence electrons to become a negative ion.
•Bromine will lose 7 valence electrons to become a positive ion.
•Bromine will gain 1 valence electron to become a negative ion.
•Bromine will gain 1 valence electron to become a positive ion.

Answers

Answer:

The correct option is;

Bromine will gain 1 valence electron to become a negative ion

Explanation:

Bromine can be found in period 4 in group 17 of the periodic table and is an halogen

The electron configuration of bromine can be presented as follows;

Electronic configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵

Therefore, an atom of bromine has 2 + 5 or 7 electrons in its outermost shell, which makes it have one less electron to complete a full octet structure and therefore, bromine has a strong affinity for electron to complete its octet structure and it is thus a strong oxidizing agent.

When bromine enters into a chemical reaction and gains the one valence electron it becomes a negatively charged ion.

What example of scientific thinking does Bohr response best indicate

Answers

Answer:

The Bohr model shows the atom as a central nucleus containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus (Figure 1). These orbits form electron shells or energy levels, which are a way of visualizing the number of electrons in the various shells

Which acid
is synthetic and not found in
nature?​

Answers

Answer:

because acids come from various chemical substances

Calculate the mass of water if the densityis 1.02 g/mL and the volume is 62 ml. M = (D(V)
.016 mL
60.78 mL
63.24 mL
73.24 mL

Answers

Answer:

The answer is

63.24 g

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

volume = 62 mL

density = 1.02 g/mL

The mass is

mass = 1.02 × 62

We have the final answer as

63.24 g

Hope this helps you

Terry bought a gold necklace at a pawnshop and was wondering if it was “real” gold. She decided to perform a density test. She placed the necklace in a graduated cylinder of water that had 47.00 mL of water and the water rose to 48.35 mL. She then weighed the necklace and found it to have a mass of 22.89 g. What is the density of Terry’s necklace?

Answers

Answer:

d = 16.96 g/mL

Explanation:

Given that,

Initial water level in graduated cylinder is 47 mL and final water level is 48.35 mL.

The weight of the neclace is 22.89 g.\

We need to find the volume of the necklace. We know that, density equals mass per unit volume. So,

[tex]d=\dfrac{m}{V_f-V_i}\\\\d=\dfrac{22.89\ g}{(48.35-47)\ mL}\\\\d=16.96\ g/mL[/tex]'

Hence, the density of Terry’s necklace is 16.96 g/mL.

Answer:

A

Explanation:

The new mine means the supply is high and the price is low, so she can afford the necklace

ANSWER PLEASE!!

Which one of the following explains why the atom in the diagram
is highly reactive?

Answers

option c is correct

number of electron in the outermost shell describe the reactivity if the outermost shell is completely filled its mean the reactivity of element is low and if it is completely filled then the element is highly reactive

What neutral element has the electron configuration described by the Aufbau diagram above.​

Answers

Answer:

Aluminium.

Explanation:

The above electronic configuration can be written in a simplified form as shown below:

1s² 2s²2p⁶ 3s²3p¹

Next, we shall determine the number of electrons in the atom of the element as follow:

Number electron = 2 + 2 + 6 + 2 + 1

Number of electron = 13

Next, we shall determine the number of protons.

Since the element is in its neutral state,

The number of electrons and protons are equal i.e

Proton = Electron

Number of electron = 13

Proton = Electron = 13

Proton = 13

Next, we shall determine the atomic number of the element.

The atomic number of an element is simply the number of protons in the atom of the element i.e

Atomic number = proton number

Proton = 13

Atomic number = 13

Comparing the atomic number of the element with those in the periodic table, the element with the above electronic configuration is aluminium since no two elements have the same atomic number.

How can the motion of an object that is NOT moving change?

Answers

Answer:

Inertia.

Explanation:

The resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight line at a constant speed, when no forces act upon them.

We have that for the Question "How can the motion of an object that is NOT moving change?" it can be said that Force is the reason for motion and is how can the motion of an object that is NOT moving change

Force

From the question we are told

How can the motion of an object that is NOT moving change?

Generally

Motion defines as the movement of a body from one place to another

Therefore

What the question is asking is

What makes the movement occur

Force

Force is defines as Mass of of an object times its acceleration but aslo is

the work done in a given time frame

Therefore

Force is the reason for motion and is how can the motion of an object that is NOT moving change

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What is the charge of a chromium ion that has lost 4 electrons?

Answers

Answer:

Explanation:

When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons. In the opposite case when an atom gains electron(s) it becomes negatively charged (more electrons than protons)

and plzs do not hate

The charge of chromium after losing 4 electrons is +2.

What is the ionic charge?

Ions are two or more charged particles that make up ionic compounds. Electrostatic attraction keeps the ions together (in the solid phase) despite their opposing charges. Cations are positively charged ions, whereas anions are negatively charged ions. Many factors make ionic molecules significant.

They act as electrolytes for batteries and conduct electricity when dissolved in water. They could form a strong bond with other charged particles, such as those found in environmental samples or the human body. They find use in fireworks, flares, and lights because they are frequently multicolored when burned. The list is endless!

Studying the nomenclature used to give ionic compounds distinctive names is a good method to become familiar with and exposed to them. You will learn how to properly explain the identification of substances in language by converting from a chemical formula to a name—a highly essential problem as the diversity and complexity of known compounds keeps growing!

Therefore, the charge on chromium after losing 4 electrons is +2.

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HELP QUICK ILL GIVE YOU BRAINLIEST AND 25 POINTS! bromine (br) has four energy levels. name 2 other elements that would have four energy levels.

Answers

Answer:

titanium and potassium

Explanation:

Answer: geranium and krypton

Explanation: hope this helps

help me please i need to sleep

Answers

Cloud is a gas.

ice is a solid.

snow is a solid.

steam is a gas.

rain is a liquid.

Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCl(aq)⟶ZnCl2(aq)+H2(g) How many milliliters of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s)?

Answers

Answer:

41.17

Explanation:

n Zn =  mass / m.wt

      = 8.75 /(65.4) = 0.1338 mole

n HCL = ( from the balanced equation )

     2HCL                  Zn

          2mole   → 1  mole

          x  mole     →             0.1338mole

     n HCL = .268 mole

M= mole/liter

6.50= 0.268/x

so u have0.04117  liter = 41.17 ml

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 41.17 ml of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s).

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of moles of zinc=  mass / molecular mass

                                       = 8.75 /(65.4) = 0.1338 mole

number of moles of HCl ( from the balanced equation )

2 moles of HCl reacts with one mole of Zn

number of moles of HCl = 2×0.1338 =0.268 mole

Molarity = number of mole of HCl/volume occupied by solution

6.50= 0.268/volume

Volume of HCl = 41.17 ml

Therefore, 41.17 ml of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s).

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1. Which number is more accurate if the correct number is 3.5. Is it 3.1, 3.3, 3.6, or 4.0?

Answers

Seems to be 3.6 since it’s closer by 1, As for 4.0 it would be 5 more.

Answer:

3.6

Explanation:

3.6 is only 0.1 away from 3.5

I hope this helped and plz give brainliest!

When a scientist analyzes experimental results, the scientist is generally:

Answers

creating graphs and preforming calculations

A wave has a length of 8 meters and a speed of 32 meters per second. What is the frequency of the wave?

Answers

Answer:

f=vλ where: f is the frequency of the wave in hertz. v is the velocity of the wave in meters per second. λ is the wavelength of the wave in meters

f= 32*8 = 256 hertz

Explanation:

Is beans in water a suspension colloid or solution

Answers

Answer:

The CORRECT answer is Solution

Explanation:

Since a Colloid is a liquid like substance that cannot be removed from other solids the only possible choice would be a Solution. becuase with a solution you can drain the solution and still get the beans.

What is the percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution?
Please help​

Answers

Answer:

The percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution is 4.61 %

Explanation:

The mass percentage of a solution is a measure of concentration that indicates the number of grams of solute that there are per 100 grams of solution.

The percent by mass is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100 to give a percentage.

[tex]percentage by mass=\frac{solute mass}{solution mass} *100[/tex]

In this case:

solute mass: 30 gsolution mass: 650 g

Replacing in the definition of percent by mass:

[tex]percentage by mass=\frac{30 g}{650 g} *100[/tex]

Solving:

percent by mass= 4.61 %

The percentage by mass of a solution with 30.0g salt dissolved in water to make 650.0g 0f solution is 4.61 %

How does the control group differ from the experimental group? Choose all the correct options.
A The control group contains more than one experimental variable
B
The control group is used as a standard to compare results to, but the experimental group is not
c The experimental group is used as a standard to compare results to, but the control group is not
D The control group is not tested or measured
E The control group does not contain the experimental variable, but the experimental group does.
F The control group does contain the experimental variable, but the experimental group does not

Answers

Answer:

B,D,E

Explanation:

The answer is B,D,E those are the correct options.


To calculate the charge of an atom you must

Answers

Answer:

The charge of an element is equal to the number of protons minus the number of electrons. The number of protons is equal to the atomic number of the element given in the periodic table. The number of electrons is equal to the atomic number minus the charge of the atom.

Explanation:

What’s the phase change to solid to gas

Answers

This phase from solid to gas is called sublimation

What is the SI unit for mass

Answers

Answer:

kilo gram

Explanation:

kilogram(kg)

Answer:

Kilogram (Kg).......

What's the largest planet on Earth?

Answers

Answer:

Asia

Explanation:

Answer:

Asia.

Explanation:


The compound M-O-H can act both as acid or base depending upon the ionisation
enthalpy of the element M. Justify by taking elements (M) of the third period of the
periodic table.
action​

Answers

Answer:

Explanation:

A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.

As an acid

Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O

As a base

3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O

NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water


A car travels 350 km in 7 hours. What is the average speed of the car (in km/hr)?

Answers

Answer:

50 km/hr

Explanation:

just divide the distance by the time (350/7)

Answer:

50 km/hr

Explanation:

Distance = 350 km

Time = 7 hours

Average Speed = ?

[tex]Average\:Speed = \frac{Distance}{Time} \\\\Average\: speed = \frac{350\:km}{7\:hr} \\\\A.V = 50\:km/hr[/tex]

Which form of heat transfer is the sun heating Earth's atmosphere? *

Answers

Answer:

Radiation

Explanation:

Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible.

The ground-state electron configuration for an element contains an unpaired 3s electron.

Answers

Answer:

Na

Sodium is located in the third row of the periodic table, where the 3s3s3, s orbital is being filled. Because sodium is the first of the two 3s3s3, s elements, its ground-state electron configuration contains a single, unpaired 3s3s3, s electron.

Explanation:

its late but ik someone can use it

The ground-state electron configuration for an element contains an unpaired 3s electron is Sodium, Na.

The ground state electron configuration of an element shows a series of how its electrons are arranged in thier orbitals at their  lowest energy state.

The element which contained an unpaired 3s electron is the Alkali metal, Sodium.

Sodium, Na has atomic number of 11 and at ground state and will therefore be written as  1s²2s²2p⁶3s¹   We can also write the condensed form since the core electrons is the same with Ne,  a noble gas which is [Ne]3s1.

The s orbital should contain at most 2 electrons , since for sodium, it has 1 electron in the 3s orbital, we say it is unpaired.

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How many kinds of atoms are there

Answers

Answer:

there are more than 109 different types of atom - one for each element.

What’s the first thing you should always do before starting a lab

Answers

Review your instructions

Which amino acid is least likely to produce a hydrogen bond with water or polar molecules?

Answers

9 amino acids (alanine, cysteine, glycine, isoleucine, leucine, methionine, phenylalanine, proline, valine) have no hydrogen donor or acceptor atoms in their side chains.
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