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 ion P$$^{3-}$$?

Accepted Answer

$$\mathrm{P}$$ with 8 dots and a $$3-$$ charge

Question 3

Which of the following species has bonds with the most ionic character?

Accepted Answer

SrO$$_2$$

Question 4

The strength of an ionic bond comes principally from:

Accepted Answer

The mutual attraction of opposite electrical charges.

Question 5

Which of these elements is unlikely to form covalent bonds?

Accepted Answer

Ar

Question 6

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 7

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

Accepted Answer

Brittleness

Question 8

Calculate the difference in electronegativity values between carbon and fluorine. (C = 2.5, F = 4.0)

Accepted Answer

$$1.5$$

Question 9

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 10

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

Accepted Answer

C–F

Question 11

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

Accepted Answer

Polar Covalent

Question 12

How many shared electrons are around the oxygen atom in the molecule shown below?

$$\mathrm{H}–\mathrm{C}=\mathrm{O}$$

Accepted Answer

6

Question 13

Which of the following atoms has the most valence electrons?

Accepted Answer

Si

Question 14

How many octet electrons are around the phosphorus atom in the following compound?

$$\mathrm{P}$$ surrounded by four $$\mathrm{H}$$ atoms

Accepted Answer

7

Question 15

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

Accepted Answer

BCl$$_3$$

Question 16

Determine the formal charge of the nitrogen atom found within the ammonia molecule, NH$$_3$$.

$$\mathrm{H}–\mathrm{N}–\mathrm{H}$$

Accepted Answer

$$0$$

Question 17

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

$$:\mathrm{C}\equiv\mathrm{O}:$$

Accepted Answer

$$-1$$

Question 18

Based on calculated formal charges, determine the overall charge (net charge) for the following compound:

$$\mathrm{O}_3 ($$ozone molecule)

Accepted Answer

$$-1$$

Question 19

Which element within the thiocyanate ion ($$:\mathrm{N}\equiv\mathrm{C}–\mathrm{S}:) $$possesses a negative charge?

Accepted Answer

S

Question 20

Which statement best describes the difference between ionic, covalent, and metallic bonding?

Accepted Answer

Ionic bonds involve electron transfer, covalent bonds involve electron sharing, and metallic bonds involve delocalized electrons.

Chemical Bonding and Lewis Structures: Study Notes

Study Guide - Practice Questions