Question 1

Which of the following electron configurations violates Hund's rule for the ground state of nitrogen ($$Z=7$$)?

Accepted Answer

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

Question 2

Which of the following orbital diagrams correctly represents the electron configuration of oxygen ($$Z=8) $$according to the Pauli exclusion principle?

Accepted Answer

Each $$2p$$ orbital contains two electrons with opposite spins

Question 3

Which element has the following ground-state electron configuration: $$[Ne]\ 3s^2$\ 3p^4$?

Accepted Answer

Sulfur

Question 4

Which of the following statements best explains why the atomic radius decreases across a period from left to right?

Accepted Answer

The effective nuclear charge increases, pulling electrons closer

Question 5

Which of the following ions has the largest radius?

Accepted Answer

$$O^{2-}$$

Question 6

Which of the following elements is expected to be paramagnetic?

Accepted Answer

Oxygen

Question 7

Which of the following has the highest first ionization energy?

Accepted Answer

Neon

Question 8

Which of the following Lewis symbols is correct for a chlorine atom?

Accepted Answer

A Cl symbol surrounded by 7 dots

Question 9

Which compound has the highest lattice energy?

Accepted Answer

$$MgO$$

Question 10

Calculate the lattice energy for $$NaCl$$ using the following data: $$Na^+ (g) + Cl^- (g) \rightarrow NaCl (s)$$, $$\Delta H = -787\ kJ/mol. $$Which of the following best describes this value?

Accepted Answer

It is the energy released when one mole of $$NaCl$$ forms from its gaseous ions

Question 11

Which of the following bonds is the most polar?

Accepted Answer

$$H-F$$

Question 12

Which of the following molecules violates the octet rule?

Accepted Answer

$$BF_3$$

Question 13

Which of the following is the best Lewis structure for $$NO_3$$^-$$ based on formal charges?

Accepted Answer

One N=O double bond and two N-O single bonds, with the negative charge delocalized over the three O atoms

Question 14

Which of the following molecules has a linear shape according to VSEPR theory?

Accepted Answer

$$CO_2$$

Question 15

Which of the following best explains why $$H_2O$$ has a bent molecular geometry?

Accepted Answer

The lone pairs on oxygen repel the bonding pairs, causing a bent shape

Question 16

Which of the following molecules has the greatest bond energy?

Accepted Answer

$$N_2$$

Question 17

Which of the following statements about bond length and bond energy is correct?

Accepted Answer

Shorter bonds have higher bond energies

Question 18

Which of the following molecules has a trigonal planar shape?

Accepted Answer

$$BF_3$$

Question 19

Which of the following ions is isoelectronic with neon?

Accepted Answer

$$F^-$$

Question 20

Which of the following best describes the effect of lone pairs on molecular geometry?

Accepted Answer

Lone pairs occupy more space than bonding pairs, causing bond angles to decrease

General Chemistry Study Guide: Chapters 9–11 (Electron Configurations, Bonding, Molecular Shapes)

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