| A | B |
|---|
| Proton charge | Positive charge |
| Neutron charge | Neutral charge |
| Electron Charge | negative charge |
| Location of Protons and neutrons | Particles found in the nucleus |
| Location of electrons | Clouds, shells, or energy levels |
| Mass of proton | 1 amu |
| mass of neutron | a little more than 1 amu or 1 amu |
| mass of electron | no mass |
| Atomic number | This # tells you the number of protons in an atom |
| Atomic mass minus atomic number | Subtracting these tells you the number of neutrons |
| How many electrons fit in the first shell? | 2 electrons |
| How many electrons fit in the second adn third shells? | 8 electrons |
