1. The smallest unit or particle of matter.
a. Atom
b. proton
c. neutron
d. electron
2. It is a negatively charged in an atom.
a. Atom
b. proton
c. nucleus
d. electron
3. This is the uncharged particles or no charge particles found within the nucleus.
a. neutron
b. nucleus
c. proton
d. electron
4. Positively charged subatomic particle forming part of the nucleus of an atom.
a, electron
b. proton
c. nucleus
d. neutron
5. It is the number of protons in an elernent.
a. atomic number
b. atomic mass
6. It is the number of protons plus the number of neutrons.
a, atomic number
b. atomic mass​