Question 1

Which of the following electron configurations correctly represents the ground state of phosphorus (Z = 15)?

Accepted Answer

1s22s22p63s23p3

Question 2

According to the periodic trend, which element in Group 7A is the most electronegative?

Accepted Answer

Cl

Question 3

Which statement is true regarding the oxygen atom in the molecule H3C-O-H?

Accepted Answer

Oxygen possesses 8 octet electrons: 6 valence and 2 shared electrons.

Question 4

What is the formal charge on the nitrogen atom in the thiocyanate ion (SCN-)?

Accepted Answer

-1

Question 5

When drawing Lewis Dot Structures, which element should never be placed in the center of the molecule?

Accepted Answer

H

Question 6

How many resonance structures are possible for the nitrate ion (NO3-)?

Accepted Answer

3

Question 7

What is the hybridization of the central carbon atom in HCN?

Accepted Answer

sp

Question 8

Nitrogen trifluoride (NF3) is best described as:

Accepted Answer

A polar molecule

Question 9

Which functional group is present in the following molecule: CH3COOH?

Accepted Answer

Carboxylic acid

Question 10

Which of the following molecules is both organic and a hydrocarbon?

Accepted Answer

CH4

Question 11

What is the atomic number of carbon?

Accepted Answer

6

Question 12

Which principle is being violated in the electron configuration diagram where two electrons occupy the same orbital with parallel spins?

Accepted Answer

Pauli Exclusion Principle

Question 13

What is the mass number of an atom with 6 protons and 8 neutrons?

Accepted Answer

14

Question 14

Which of the following is true about isotopes?

Accepted Answer

They have the same atomic number but different mass numbers.

Question 15

What is the formal charge formula for an atom in a molecule?

Accepted Answer

FormalCharge=ValenceElectrons-(NonbondingElectrons+BondingElectrons/2)

Question 16

Which of the following molecules has a perfect shape and is nonpolar?

Accepted Answer

CO2

Question 17

How many electron groups are around the central atom in a tetrahedral molecule?

Accepted Answer

4

Question 18

Which of the following is a correct condensed electron configuration for chlorine (Z = 17)?

Accepted Answer

[Ne]3s23p5

Question 19

Which of the following best describes a resonance hybrid?

Accepted Answer

A composite of all major resonance structures.

General Chemistry Study Notes: Atomic Structure, Electron Configuration, Bonding, and Molecular Properties

Study Guide - Practice Questions