Unit 6 review atomic theory

The atomic mass is equal to _.

• the number of protons only
• the number of neutrons only
• the total number of protons and neutrons
• the number of protons, neutrons, and electrons.

How many neutrons does B (Boron) contain?

• 5
• 11
• 6
• 10.811

What is the mass number of bromine?

• 35

• 45

• 80

• 79.904

How many electrons does this magnesium ion have?

• 24

• 12

• 10

• 14

How many neutrons does this Neon atom have?

• 21

• 11

• 10

• 12

What is the mass number of this Neon atom?

• 10

• 11

• 21

• 20

What particles determine the mass number?

• Protons and electrons

• Electrons and neutrons

• Protons and neutrons

• Protons, neutrons, and electrons

How many neutrons does this bromine atom have?

• 35

• 45

• 80

• 115

What changes when an atom becomes an ion?

• The number of electrons

• The number of protons

• The number of neutrons

• Both the number of neutrons and electrons

What happened to this Magnesium atom to make it an ion?

• It LOST electrons

• It GAINED electrons

• It GAINED protons

• It LOST protons