Atomic Structure Practice

Protons have a (a)   charge.

• positive
• neutral
• negative

Which particle is the smallest and has very little mass?

• Protons

• Neutrons

• Electrons

In the diagram if the black circles represent protons, what do the white circles represent?

• Protons

• Neutrons

• Electrons

The number of ____________________ distinguishes the atoms of one element from the atoms of another.

• Protons

• Neutrons

• Electrons

The atomic number is the number of ____________ in the nucleus.

• Protons

• Neutrons

• Electrons

The mass number is the total number of __________ and __________ in the nucleus.

• Protons and Neutrons

• Protons and Electrons

• Neutrons and Electrons

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

The subatomic particles in red are

• Electrons
• Neutrons
• Protons

How many electrons does Oxygen have?

• 16

• 8

• 15.99

• O

What is the mass number of this atom?

• 1

• 3

• 4

• 7