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