Chapter 2 Multiple-choice questions

. An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?

An atom of sodium has 11 protons, 11 electrons, and 11 neutrons.

An atom of sodium has 11 protons, 12 electrons, and 11 neutrons.

An atom of sodium has 11 protons, 11 electrons, and 12 neutrons.

An atom of sodium has 11 protons, 12 electrons, and 12 neutrons.

. An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain?

15

16

31

. What is the chemical symbol for magnesium?

Ma

Mn

M

Mg

. Complete the following sentence: 'Different isotopes of the same element have...'

...the same number of protons, but differing numbers of neutrons and electrons

...the same number of neutrons, but differing numbers of protons and electrons

...the same number of protons and neutrons, but differing numbers of electrons

...the same number of protons and electrons, but differing numbers of neutrons

. Shell three contains how many sub-shells?

1

2

3

4

. The 3d subshell can hold a maximum of how many electrons?

1

2

6

8

10

. Calcium has an atomic number of 20. What is its electronic configuration?

1s² 2s² 2p⁶

1s² 2s² 2p⁶ 3s² 3p⁶ 3d²

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

1s² 2s² 2p⁶ 2d² 3s² 3p⁶

. Which of the following places the atomic subshells in the correct order of relative energy, starting with the subshell of lowest energy?

d, p, s

s, d, p

s, p, d

p, s, d

. There are how many naturally-occurring isotopes of oxygen?

1

2

3

4

. The mass of a single atom of a particular isotope is called which of the following?

Its atomic number

Its atomic weight

Its atomic mass

Its relative atomic mass

. The identity of a chemical element is determined by which of the following?

The number of protons it possesses

The number of neutrons it possesses

The number of electrons it possesses

The sum of the number of protons and neutrons it possesses

The sum of the number of protons and electrons it possesses

. Which of the following statements correctly defines the terms anion and cation?

An anion is a negatively charged ion; a cation is a positively charged ion.

An anion is a positively charged ion; a cation is a negatively charged ion.

. Which of the following statements correctly defines the terms period and group as they relate to the periodic table?

A period is a horizontal row in the periodic table; a group is a vertical column.

A group is a horizontal row in the periodic table; a period is a vertical column.

. Which of the following statements correctly defines the terms period and group as they relate to the periodic table?

Elements on the left of the periodic table have high ionization energies; they form positive ions readily

Elements on the left of the periodic table have low ionization energies; they form positive ions readily

Elements on the left of the periodic table have high ionization energies; they form negative ions readily

Elements on the left of the periodic table have low ionization energies; they form negative ions readily

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