The mass of a proton is:

• 1

• 0

The mass of a neutron is:

• 1

• 0

The mass of an electron is:

• 1

• 0

The charge of a proton is

• +1

• 0

• -1

The charge of an electron is

• +1

• 0

• -1

The charge of a neutron is

• +1

• 0

• -1

Compared to the charge and mass of a proton, an electron has ______.

• the same charge and a smaller mass

• the same charge and the same mass

• an opposite charge and a smaller mass

• an opposite charge and the same mass

A proton has approximately the same mass as ____.

• a neutron

• an alpha particle

• a beta particle

• an electron

Which symbols represent atoms that are isotopes?

• C-14 and N-14

• O-16 and O-18

• I-131 and I-131

• Rn-222 and Ra-222

Which atom contains exactly 15 protons?

• P-32

• S-32

• O-15

• N-15