Question 1

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

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^3$$

Question 2

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

Accepted Answer

Fluorine (F)

Question 3

According to the octet rule, how many valence electrons does oxygen have in a water molecule (H$$_2O$$), and how many are shared?

Accepted Answer

6 valence electrons, 4 shared electrons

Question 4

What is the formal charge on the central carbon atom in the thiocyanate ion (NCS$$^-$$)?

Accepted Answer

0

Question 5

Which of the following is a correct step when drawing the Lewis Dot Structure for COCl$$_2$$?

Accepted Answer

Place carbon in the center because it is the least electronegative (excluding hydrogen).

Question 6

Which statement about resonance structures is TRUE?

Accepted Answer

Resonance structures differ only in the placement of electrons, not atoms.

Question 7

What is the hybridization of the central atom in HCN (hydrogen cyanide)?

Accepted Answer

sp

Question 8

Which of the following molecules is polar?

Accepted Answer

NF$$_3$$

Question 9

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

Accepted Answer

Carboxylic acid

Question 10

Which of the following is a hydrocarbon?

Accepted Answer

Cyclohexane

Question 11

What is the atomic number of an atom with 17 protons, 18 neutrons, and 17 electrons?

Accepted Answer

17

Question 12

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

Accepted Answer

Pauli Exclusion Principle

Question 13

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 14

Which of the following best describes a resonance hybrid?

Accepted Answer

A composite of all major resonance structures.

Question 15

How many unhybridized p orbitals are present on the central atom of a molecule with sp$$^2$$ hybridization?

Accepted Answer

1

Question 16

Which of the following molecules has a perfect (nonpolar) shape?

Accepted Answer

CCl$$_4$$

Question 17

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

Accepted Answer

[Ne] 3s$$^2 3p$^5$$

Question 18

Which of the following statements about the octet rule is FALSE?

Accepted Answer

Hydrogen follows the octet rule.

Question 19

Which of the following best describes the trend in electronegativity across a period?

Accepted Answer

It increases from left to right.

Question 20

Which of the following is the correct formal charge for oxygen in the nitrate ion (NO$$_3^-) if it is $$double-bonded to nitrogen?

Accepted Answer

0

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

Study Guide - Practice Questions