Question 1

Which of the following elements has the greatest number of valence electrons?

Accepted Answer

Bromine (Br)

Question 2

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

They contain delocalized electrons that can move freely throughout the lattice.

Question 3

Which of the following species is most likely to have an incomplete octet in its stable form?

Accepted Answer

BF3

Question 4

A student draws the Lewis dot symbol for the Te atom. Which of the following is correct?

Accepted Answer

Te with 6 dots

Question 5

Which of the following bonds is expected to be the most polar?

Accepted Answer

S–F

Question 6

Which of the following best describes the main source of strength in an ionic bond?

Accepted Answer

The electrostatic attraction between oppositely charged ions

Question 7

Which element is least likely to form covalent bonds?

Accepted Answer

Argon (Ar)

Question 8

A molecule has a bond with a ΔEN (electronegativity difference) of 2.1. What type of bond is this most likely to be?

Accepted Answer

Ionic

Question 9

Which of the following compounds is most likely to conduct electricity when dissolved in water?

Accepted Answer

NaCl

Question 10

What is the formal charge on nitrogen in NH3?

Accepted Answer

0

Question 11

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from bottom to top within a group.

Question 12

Which of the following best describes the bonding in a sample of copper metal?

Accepted Answer

Metallic bonding with delocalized electrons

Question 13

Arrange the following bonds in order of increasing polarity: C–H, N–H, O–H.

Accepted Answer

C–H \u003c N–H \u003c O–H

Question 14

Which of the following molecules contains a central atom with an expanded octet?

Accepted Answer

SF6

Question 15

A student is asked to draw the Lewis dot symbol for the P3− ion. Which is correct?

Accepted Answer

P with 8 dots and a 3− charge

Question 16

Which of the following best explains why NaCl has a high melting point?

Accepted Answer

It is held together by strong electrostatic forces between ions.

Question 17

Which of the following statements about the octet rule is FALSE?

Accepted Answer

All main group elements must have exactly 8 electrons in their valence shell.

Question 18

Which of the following best describes the direction of the dipole moment in a polar bond?

Accepted Answer

From the less electronegative atom to the more electronegative atom

Question 19

Which of the following pairs of atoms would form a bond with the greatest ionic character?

Accepted Answer

Na and Cl

Question 20

A sample of an unknown solid is shiny, malleable, and conducts electricity. What type of bonding is most likely present?

Accepted Answer

Metallic

Question 21

Which of the following is the correct formula for calculating the formal charge on an atom in a molecule?

Accepted Answer

Formal Charge = Valence Electrons − (Nonbonding Electrons + 1/2 × Bonding Electrons)

Chemical Bonding and Lewis Structures: Study Notes

Study Guide - Practice Questions