Unit 2 Lesson 2 Practice: Subatomic Particles

1) What charge do neutrons have?

• +1
• -1
• 0

2) Most of the volume of an atom is __________________

• Protons and electrons
• The nucleus
• Empty space (electron cloud)

3) Most of the mass of an atom is in the

• The nucleus
• Empty space (electron cloud)

4) What is the nucleus made of?

• electrons and protons
• protons and neutrons
• protons only

5) What is located outside of the nucleus?

• Electrons
• Protons
• Neutrons
• Nothing

6) Which subatomic particle determines the name/identity (atomic number) of an atom?

• Protons
• Neutrons
• Electrons

7) An atom, which has an overall neutral (0) charge, must have equal amounts of protons (+1 charge) and

• Neutrons (0 charge)
• Electrons (-1 charge)

Which particles have mass? (choose 2)

• proton
• neutron
• electron

Which particle helps keep the nucleus stable?

• proton
• neutron
• electron

Which particle can be involved in chemical reactions?

• proton
• neutron
• electron