Question 1

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

Accepted Answer

Bromine (Br)

Question 2

A patient is exposed to a toxic gas that reacts with sodium metal to form a white crystalline solid. Which type of chemical bond is most likely present in the resulting compound?

Accepted Answer

Ionic bond

Question 3

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

Accepted Answer

Their valence electrons are delocalized and free to move throughout the lattice.

Question 4

Which of the following elements is LEAST likely to form covalent bonds?

Accepted Answer

Potassium (K)

Question 5

Arrange the following bonds in order of decreasing dipole moment: H–F, H–Cl, H–Br, H–I.

Accepted Answer

H–F \u003e H–Cl \u003e H–Br \u003e H–I

Question 6

Which of the following bonds is the most polar?

Accepted Answer

S–F

Question 7

A molecule of CO₂ is analyzed. How many shared electrons are around the oxygen atom in this molecule?

Accepted Answer

4

Question 8

Which of the following species is most likely to have an expanded octet?

Accepted Answer

PCl₅

Question 9

Calculate the formal charge of nitrogen in ammonia (NH₃).

Accepted Answer

0

Question 10

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonds involve transfer of electrons; covalent bonds involve sharing of electrons.

Question 11

A chemist is analyzing the Lewis structure of the SCN⁻ ion. Which atom is most likely to carry a negative formal charge in the most stable resonance structure?

Accepted Answer

Nitrogen (N)

Question 12

Which of the following statements about electronegativity is TRUE?

Accepted Answer

Electronegativity increases from bottom to top within a group.

Question 13

Which of the following compounds is expected to have the most ionic character?

Accepted Answer

NaCl

Question 14

A scientist is drawing the Lewis dot symbol for a neutral tellurium (Te) atom. How many dots should be placed around the symbol?

Accepted Answer

6

Question 15

Which of the following best describes the electrons in a metallic bond?

Accepted Answer

They are delocalized and move freely among metal cations.

Question 16

Which of the following molecules is an example of an incomplete octet?

Accepted Answer

BF₃

Question 17

A student is asked to calculate the formal charge on the oxygen atom in carbon monoxide (CO). The Lewis structure shows a triple bond between C and O, and a lone pair on O. What is the formal charge on oxygen?

Accepted Answer

+1

Question 18

Which of the following best explains why noble gases like argon (Ar) are generally unreactive?

Accepted Answer

They have a full valence shell and do not need to gain, lose, or share electrons.

Question 19

In the ion PH₄⁺, how many electrons surround the phosphorus atom?

Accepted Answer

8

Question 20

Which of the following best describes a nonpolar covalent bond?

Accepted Answer

A bond with equal sharing of electrons between two atoms.

Chemical Bonding and Lewis Structures: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards