Question 1

Which of the following statements best describes an atom?

Accepted Answer

An atom is the smallest unit of a chemical element and matter.

Question 2

Which subatomic particle has a positive charge and is located in the nucleus?

Accepted Answer

Proton

Question 3

What is the atomic number of an element equal to?

Accepted Answer

The number of protons only

Question 4

A neutral oxygen atom has an atomic number of 8 and a mass number of 16. How many neutrons does it have?

Accepted Answer

8

Question 5

How many valence electrons does a nitrogen atom (atomic number 7) have?

Accepted Answer

5

Question 6

According to the octet rule, why is neon (Ne) unreactive?

Accepted Answer

Its valence shell is full of electrons.

Question 7

How many electrons does an oxygen atom need to fulfill the octet rule?

Accepted Answer

2

Question 8

What is an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 9

Carbon-13 and Carbon-14 are both isotopes of carbon. What makes them different from Carbon-12?

Accepted Answer

Each has an extra neutron.

Question 10

A radioactive isotope has a half-life of 5,730 years. How many years must pass for a sample to decay to 1/4 of its original amount?

Accepted Answer

$$11,460$$

Question 11

Which of the following is NOT a use of radioactive isotopes?

Accepted Answer

All of the above are uses

Question 12

What type of bond involves the sharing of electrons between two atoms?

Accepted Answer

Covalent bond

Question 13

Which of the following best describes a nonpolar covalent bond?

Accepted Answer

Electrons are shared equally between atoms.

Question 14

What property of the bond between hydrogen and oxygen in a water molecule makes it a polar bond?

Accepted Answer

Oxygen is more electronegative than hydrogen.

Question 15

Which of the following is true of ALL atoms that are anions?

Accepted Answer

The atom has more electrons than protons.

Question 16

What is the main attractive force in an ionic bond?

Accepted Answer

Electrical attraction between oppositely charged ions

Question 17

Which of the following is a weak non-covalent bond commonly found in biology?

Accepted Answer

Hydrogen bond

Question 18

Which of the following atoms would be most likely to lose an electron and become a cation of +1?

Accepted Answer

An atom with one electron in its outer shell

Question 19

Which of the following best describes the relationship between intramolecular and intermolecular bonds?

Accepted Answer

Intramolecular bonds are interactions within a molecule, while intermolecular bonds are interactions between molecules.

Question 20

A water molecule is held together by which type of bond?

Accepted Answer

Covalent bond

Atoms, Elements, and Chemical Bonding: Foundations of General Chemistry

Study Guide - Practice Questions