Atom Practice Quiz

Atomic number refers to the number of ____ in an atom.

• protons

• neutrons

• electrons

The ___ number is the sum of the protons and neutrons in an atom.

• atomic

• mass

• isotope

• charge

The mass number is found by...

• adding protons, neutrons, and electrons

• adding protons and electrons

• adding neutrons and electrons

• subtracting electrons from protons

• adding protons and neutrons

How many protons would be in an atom of carbon-13? (Click to enlarge periodic table.)

• 6

• 7

• 12

• 13

How many neutrons are found in an atom of carbon-13? (Click to enlarge periodic table.)

• 6

• 7

• 12

• 13

What is the atomic number of this atom? (Click to enlarge.)

• 5

• 6

• 10

• 11

• 15

What is the mass number of this atom? (Click to enlarge.)

• 5

• 6

• 10

• 11

• 15

An atom has 9 protons, 10 neutrons, and 9 electrons. What is its atomic number?

• 9

• 10

• 18

• 19

• 28

An atom has 9 protons, 10 neutrons, and 9 electrons. What is its mass number?

• 9

• 10

• 18

• 19

• 28

Which element has an atomic number of 30? (Click to enlarge the periodic table.)