Question 1

Which of the following ions is isoelectronic with argon (Ar)?

Accepted Answer

Cl−

Question 2

Which of the following correctly describes the electron configuration for the Fe3+ ion?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^5$

Question 3

Which of the following statements best explains why the radius of a Na+ ion is much smaller than that of a neutral Na atom?

Accepted Answer

Na+ has lost its outermost electron shell, resulting in a smaller radius.

Question 4

Which of the following ions has the largest ionic radius?

Accepted Answer

I−

Question 5

Which of the following elements has the highest first ionization energy?

Accepted Answer

Ne

Question 6

Why is the first ionization energy of Be higher than that of B, despite B being to the right of Be in the periodic table?

Accepted Answer

Be has a filled 2s subshell, making it more stable.

Question 7

Which of the following best describes the trend in lattice energy for ionic compounds?

Accepted Answer

Lattice energy increases as the charges on the ions increase and the ionic radii decrease.

Question 8

Which of the following compounds has the highest lattice energy based on the data provided?

Accepted Answer

MgO

Question 9

What is the electron configuration for the S2− ion?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 10

Which of the following best explains why the formation of NaCl(s) from Na(s) and Cl2(g) is energetically favorable, despite the endothermic steps involved?

Accepted Answer

The lattice energy released during the formation of NaCl(s) is greater than the energy required for ionization and dissociation.

Question 11

Which of the following ions is isoelectronic with krypton (Kr)?

Accepted Answer

Sr2+

Question 12

Which of the following elements will form an ion with the electron configuration $$[\mathrm{Ne}]$$?

Accepted Answer

Na+

Question 13

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve a filled s and p subshell in their valence shell.

Question 14

Which of the following ions would have the smallest radius?

Accepted Answer

Na+

Question 15

Which of the following best explains why the electron affinity of noble gases is generally positive or zero?

Accepted Answer

Noble gases have filled valence shells, so adding an electron is energetically unfavorable.

Question 16

Which of the following ions has the same number of electrons as a neutral atom of calcium?

Accepted Answer

K+

Question 17

Which of the following best describes the trend in first ionization energy across a period from left to right?

Accepted Answer

It increases due to increasing nuclear charge and decreasing atomic radius.

Question 18

Which of the following ions is most likely to form from an atom of aluminum?

Accepted Answer

Al3+

Question 19

Which of the following best explains why MgO has a much higher lattice energy than NaCl?

Accepted Answer

MgO has ions with higher charges and similar ionic radii compared to NaCl.

Question 20

Which of the following ions has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^6$$?

Accepted Answer

O2−

Chapter 6: Ionic Compounds – Electron Configurations, Ionization Energies, and Lattice Energies

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