Question 1

Which of the following elements is most likely to have an expanded octet in a stable compound?

Accepted Answer

Phosphorus (P)

Question 2

A patient is given a medication containing the ion SCN⁻. What is the formal charge on the nitrogen atom in this ion, given the most common Lewis structure?

Accepted Answer

0

Question 3

Which of the following species contains bonds with the greatest ionic character?

Accepted Answer

SrO

Question 4

Which element is least likely to form covalent bonds?

Accepted Answer

Argon (Ar)

Question 5

A Lewis structure for N₂F₂ shows each nitrogen atom bonded to one fluorine and to each other. How many shared electrons are present in the molecule?

Accepted Answer

8

Question 6

Which of the following best describes the electrons responsible for the electrical conductivity of copper metal?

Accepted Answer

Valence electrons delocalized and free to move

Question 7

Which of the following bonds is the most polar?

Accepted Answer

S–F

Question 8

A student draws the Lewis dot symbol for Te (tellurium). How many valence electrons should be shown?

Accepted Answer

6

Question 9

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from bottom to top within a group.

Question 10

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

Accepted Answer

8

Question 11

Which of the following best explains why sodium chloride (NaCl) is a solid with a high melting point at room temperature?

Accepted Answer

It is held together by strong electrostatic attraction between ions.

Question 12

A molecule of CO (carbon monoxide) has a triple bond between C and O. What is the formal charge on the carbon atom in the most stable Lewis structure?

Accepted Answer

+1

Question 13

Which of the following is a correct statement about the octet rule?

Accepted Answer

Elements in period 3 or higher can have more than eight valence electrons.

Question 14

Which of the following pairs of atoms would form a bond with the largest difference in electronegativity?

Accepted Answer

C and F

Question 15

A transition metal ion, Co⁺, is formed. Which of the following is true about its Lewis dot symbol?

Accepted Answer

It will have fewer dots than neutral Co due to loss of an electron.

Question 16

Which of the following best describes a metallic bond?

Accepted Answer

Valence electrons are delocalized and move freely among metal ions.

Question 17

A molecule has a bond with ΔEN = 1.8. According to the classification by electronegativity difference, what type of bond is this?

Accepted Answer

Ionic

Question 18

Which of the following is a correct application of the formal charge formula?

Accepted Answer

Formal charge = Valence electrons - (Nonbonding electrons + 1/2 Bonding electrons)

Question 19

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

Accepted Answer

Bromine (Br)

Question 20

A Lewis structure for NO₂⁻ (nitrite ion) shows one nitrogen atom bonded to two oxygen atoms, with one double bond and one single bond. What is the sum of the formal charges in the ion?

Accepted Answer

-1

Chemical Bonding and Lewis Structures: Study Notes for General Chemistry

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