| A | B |
|---|
| Proton | Has a mass of about 1 amu and a positive charge |
| Electron | Has a mass of about .00055 amu and a negative charge |
| Neutron | Has a mass of about 1 amu and no charge |
| Isotope | Same number of protons, a different number od neutrons |
| Atomic number | The number of protons in the nucleus |
| Atomic mass | the weighted average of the naturally occuring isotopes |
| AMU | A mass unit used to describe the mass of a nuclear size particle |
| Ion | A charged particle |
| Cation | A positive ion |
| Anion | A negative ion |
| Atomic mass number | The number of protons plus the number of neutrons in a nucleus |
| Atomic spectrum | An element's fingerprint |
| Photon | A quantum of light |
| Periods | The horizontal rows on the periodic table |
| Groups | The vertical columns on the periodic table |
