| A | B |
|---|
| Proton | positive particle |
| strong force | holds nucleus together |
| neutron | neutral particle |
| electron | negative particle |
| isotope | Same number of protons & electrons, different number of neutrons |
| weak force | force that changes neutrons to protons and electrons |
| ion | charge particle |
| atomic number | represents the sum of protons in the nucleus of an atom |
| gravitational force | pulls objects toward one another |
| nucleus | central region of the atom |
| electron cloud | region where electrons are likely to be found |
| atomic mass unit (amu) | a unit of mass that describes the mass of an atom or molecule |
