Unit 3 Atomic Structure

Which subatomic particle has a positive (+) charge?

• Neutron
• Proton
• Electron

True or False - Protons and Neutrons have about the same mass.

• True - They have about the same mass
• False - They do not have about the same mass

Which subatomic particle has a negative (-) charge?

• Proton
• Electron
• Neutron

Which subatomic particle has a neutral or no charge?

• Proton
• Electron
• Neutron

Which two subatomic particles make up the nucleus of an atom?

• Protons and Electrons
• Neutrons and Electrons
• Electrons and Protons
• Protons and Neutrons

Where are the Electrons found in the structure of an atom?

• In the nucleus
• In spaces around the nucleus

The name of this particle means indivisible and it is the building block of matter

• molecule

• compound

• atom

• isotope

The mass of an atom is (rearrange the formula to calculate neutrons)

• equal to the number of protons

• the protons + electrons

• the protons + neutrons

• the protons + neutrons + electrons

All atoms are considered neutral which means.

• protons = electrons

• protons = neutrons

• neutrons = electrons

• protons = neutrons = electrons

What is the mass number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons