Question 1

Which of the following statements best describes the Aufbau Principle in electron configuration?

Accepted Answer

Electrons fill orbitals in order of increasing energy, starting from the lowest energy orbital.

Question 2

Which of the following is the correct condensed electron configuration for phosphorus (Z = 15)?

Accepted Answer

[Ne] $$3s^2$$ $$3p^3$$

Question 3

Which element is the most electronegative in Group 7A (halogens)?

Accepted Answer

F

Question 4

Electronegativity generally ________ as you move from left to right across a period and ________ as you move up a group in the periodic table.

Accepted Answer

increases; increases

Question 5

In the molecule H$$_3$$COH (methanol), how many valence electrons and shared electrons does the oxygen atom possess?

Accepted Answer

8 valence electrons and 2 shared electrons

Question 6

What is the formal charge on the central carbon atom in the Lewis structure of COCl$$_2$$?

Accepted Answer

0

Question 7

Which of the following is NOT a correct step in drawing a Lewis Dot Structure?

Accepted Answer

Hydrogen is always placed in the center of the molecule.

Question 8

Which of the following statements about resonance structures is TRUE?

Accepted Answer

Resonance structures differ only in the placement of electrons.

Question 9

What is the hybridization of the central atom in HCN, and how many unhybridized p orbitals does it have?

Accepted Answer

sp; 2 unhybridized p orbitals

Question 10

Which of the following molecules is polar?

Accepted Answer

NH$$_3$$

Question 11

Which functional group is present in the following structure: CH$$_3$$COOH?

Accepted Answer

Carboxylic acid

Question 12

Which of the following is a hydrocarbon?

Accepted Answer

CH$$_4$$

Question 13

A neutral atom of carbon-14 ($$^{14}C) $$has how many protons, neutrons, and electrons?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 14

Which principle is being violated if two electrons in the same orbital have the same spin?

Accepted Answer

Pauli Exclusion Principle

Question 15

Which of the following best describes a resonance hybrid?

Accepted Answer

A composite of all major resonance structures.

Question 16

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

Accepted Answer

4

Question 17

Which of the following molecules is nonpolar due to its perfect shape?

Accepted Answer

CO$$_2$$

Question 18

What is the formal charge on the nitrogen atom in the ammonium ion (NH$$_4^+$$)?

Accepted Answer

0

Question 19

Which of the following best describes the difference between isotopes of an element?

Accepted Answer

They have different numbers of neutrons.

Question 20

Which of the following is the correct order of filling for the first three energy levels according to the Aufbau Principle?

Accepted Answer

1s, 2s, 2p, 3s

GOB Chemistry Study Guide: Atomic Structure, Bonding, and Organic Chemistry Fundamentals

Study Guide - Practice Questions