Question 1

Which of the following best describes the relationship between protons, neutrons, and electrons in a neutral atom?

Accepted Answer

The number of protons equals the number of electrons, resulting in no net charge.

Question 2

Given the atomic number ($$Z) of an $$element is 8 and its mass number ($$A) is 16$$, how many neutrons does the atom have?

Accepted Answer

$$A - Z = 16 - 8 = 8$$ neutrons

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 4

If an atom has 6 protons, 6 neutrons, and 6 electrons, what is its atomic number and mass number?

Accepted Answer

Atomic number: 6, Mass number: 12

Question 5

Which subatomic particle is responsible for the chemical properties of an element?

Accepted Answer

Electrons

Question 6

A sodium atom has an atomic number of 11. If it loses one electron, what is the resulting charge?

Accepted Answer

$$+1$$

Question 7

Which of the following best explains why atoms are electrically neutral?

Accepted Answer

Because the number of protons equals the number of electrons.

Question 8

If an atom has an atomic number of 15 and a mass number of 31, how many neutrons does it have?

Accepted Answer

$$31 - 15 = 16$$ neutrons

Question 9

Which of the following is true about the nucleus of an atom?

Accepted Answer

It contains protons and neutrons.

Question 10

A carbon atom has 6 protons and 6 neutrons. What is its mass number?

Accepted Answer

$$12$$

Question 11

Which of the following would result in the formation of a cation?

Accepted Answer

An atom loses an electron.

Question 12

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its mass number?

Accepted Answer

$$35$$

Question 13

Which of the following is the correct formula for calculating the number of neutrons in an atom?

Accepted Answer

$$\mathrm{Number\ of\ neutrons} = \mathrm{Mass\ number} - \mathrm{Atomic\ number}$$

Question 14

Which of the following best describes an isotope of hydrogen?

Accepted Answer

It has one proton and one neutron.

Question 15

If an atom has 20 protons, 22 neutrons, and 18 electrons, what is its net charge?

Accepted Answer

$$+2$$

Atomic Structure and Chemical Bonding

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