Question 1

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

Accepted Answer

Br

Question 2

What is the correct Lewis dot symbol for the phosphorus ion, $$\mathrm{P$$^{3-}$$}$$?

Accepted Answer

A 'P' symbol surrounded by 8 dots

Question 3

The strength of an ionic bond comes principally from:

Accepted Answer

The mutual attraction of opposite electrical charges

Question 4

Which of these elements is unlikely to form covalent bonds?

Accepted Answer

Ar

Question 5

Which of the following is best description of the free flowing electrons in metallic bonding?

Accepted Answer

Valence electrons that can move freely between metal ions

Question 6

Which of the following is NOT a physical property attributed to metallic bonding?

Accepted Answer

Brittleness

Question 7

Calculate the difference in electronegativity values between carbon and fluorine. ($$\mathrm{EN_{F}} = 4.0$$, $$\mathrm{EN_{C}} = 2.5)$$

Accepted Answer

$$1.5$$

Question 8

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

Accepted Answer

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

Question 9

For those listed below, which has the most polar bond?

Accepted Answer

Cl–F

Question 10

Which of the following correctly identifies the chemical bond between a carbon and oxygen atom?

Accepted Answer

Polar Covalent

Question 11

How many shared electrons are around the oxygen atom in the following molecule: $$\mathrm{H_2CO}$$?

Accepted Answer

6

Question 12

Which of the following atoms has the most valence electrons?

Accepted Answer

N

Question 13

How many octet electrons are around the phosphorus atom in the following compound: $$\mathrm{PH_4$^+}$$?

Accepted Answer

7

Question 14

Which of the following contains an atom that may have an incomplete octet?

Accepted Answer

$$\mathrm{BC_3$}$$

Question 15

Determine the formal charge of the nitrogen atom found within the ammonia molecule, $$\mathrm{NH_3$}.$$

Accepted Answer

$$0$$

Question 16

Calculate the formal charge of the carbon atom within a carbon monoxide molecule.

Accepted Answer

$$-1$$

Question 17

Based on calculated formal charges, determine the overall charge (net charge) for the following compound: $$\mathrm{CO_3$^{2-}}.$$

Accepted Answer

$$-2$$

Question 18

Which element within the thiocyanate ion ($$\mathrm{NCS^-}) $$possesses a negative charge?

Accepted Answer

S

Question 19

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

Accepted Answer

$$\mathrm{SF_6$}$$

Chemical Bonding and Lewis Structures: Study Guide

Study Guide - Practice Questions