| A | B |
|---|
| atom | smallest particle that holds its elemental properties |
| ion | atom with a charge |
| proton | positively charged particle |
| neucleus | center of atom where protons and neutrons are |
| neutrons | add stability but no charge to nucleus |
| electrons | negative charged low mass particles |
| orbital | energy levels where electrons are found |
| cation | positively charged ion |
| anion | negatively charged ion |
| mass of 1 amu | protons and neutrons have this mass |
| mass of 1/2000 amu | electrons have this mass |
| isotope | has same protons but different neutrons |
| max number of electrons in first orbital | 2 (two) |
| atomic number | number of protons, periodic table organized by this |
| atomic mass | mass of protons and neutrons added together |
