Unit 3: Atoms Test

The model below represents the atom

• Flourine
• Chlorine
• Argon
• Bromine

Barium (Ba) has ___________ protons. (use your periodic table)

• 56
• 137
• 81

Argon (Ar) has ____________ neutrons. (use your periodic table)

• 18
• 39.9
• 40
• 22

Assuming Calcium (Ca) is neutral, how many electrons does it have? (use your periodic table)

• 20
• 40
• 60

An element has 27 protons. Which element is it?

• Aluminum
• Cobalt
• Silicon
• Manganese

The model below represents which element?

• Magnesium
• Sodium
• Vanadium
• Potassium

Who invented the model below?

• Niels Bohr
• Ernest Rutherford
• Democritus
• John Dalton

What subatomic particles are found in the nucleus?

• Electrons and protons
• Protons and neutrons
• Neutrons and electrons
• Only protons

What two subatomic particles make up the mass of an atom?

• Electrons and protons
• Protons and neutrons
• Neutrons and electrons
• Only protons

Which subatomic particle is the smallest? (has no mass)

• Electrons
• Protons
• Neutrons