Question 1

Which of the following best describes the formation of an ionic bond?

Accepted Answer

A transfer of one or more electrons from a metal to a nonmetal, resulting in oppositely charged ions that attract each other.

Question 2

What is the electron configuration of the Mg$$^{2+}$$ ion?

Accepted Answer

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

Question 3

Which of the following ions has the same electron configuration as Ne?

Accepted Answer

All of the above

Question 4

Why are cations generally smaller than their parent neutral atoms?

Accepted Answer

Because they lose electrons, reducing electron-electron repulsion and sometimes losing an entire electron shell.

Question 5

Which of the following ions is largest in size?

Accepted Answer

I$$^{-}$$

Question 6

The electron configuration for Fe$$^{3+} is$$:

Accepted Answer

$$[Ar]\ 3d^5$

Question 7

Which statement best explains why anions are larger than their parent atoms?

Accepted Answer

Anions have more electrons, increasing electron-electron repulsion and expanding the electron cloud.

Question 8

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

Accepted Answer

Ne

Question 9

A third-row element has successive ionization energies: $$E_{i1} = 1,817 kJ/$$mol, $$E_{i2} = 2,745 kJ/$$mol, $$E_{i3} = 11,575 kJ/$$mol. What does the large jump between $$E_{i2}$$ and $$E_{i3}$$ indicate?

Accepted Answer

The removal of a core electron after all valence electrons have been removed.

Question 10

Which of the following ions does NOT have a true noble gas electron configuration?

Accepted Answer

Tl$$^{3+}$$

Question 11

Which compound would you expect to have the highest lattice energy?

Accepted Answer

MgO

Question 12

What is the correct electron configuration for the N$$^{3-}$$ ion?

Accepted Answer

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

Question 13

Which of the following best describes electron affinity?

Accepted Answer

The energy released when a neutral atom gains an electron to form an anion.

Question 14

Which of the following ions is isoelectronic with Ar?

Accepted Answer

K$$^{+}$$

Question 15

Which factor most strongly increases the lattice energy of an ionic solid?

Accepted Answer

Small ionic radii and high charges.

Question 16

If a neutral atom loses all its valence electrons, what happens to its ionization energy for subsequent electrons?

Accepted Answer

It increases sharply.

Question 17

Which of the following best explains why noble gases have near-zero electron affinity?

Accepted Answer

Their valence shells are already full, so adding an electron is energetically unfavorable.

Question 18

Which of the following ions has the smallest radius?

Accepted Answer

Na$$^{+}$$

Question 19

Which of the following statements about the formation of Fe$$^{2+}$$ and Fe$$^{3+} is $$correct?

Accepted Answer

Fe$$^{2+} is $$formed by losing two electrons, and Fe$$^{3+} by $$losing three electrons, both from the 4s and 3d orbitals.

Question 20

Which of the following best describes the relationship between ionic charge and melting point in ionic solids?

Accepted Answer

Higher ionic charges lead to stronger electrostatic attraction and higher melting points.

Ionic Bonds and Electronic Configurations of Ions (CHEM101 Chapter 6 Study Notes)

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