| A | B |
|---|
| metals | shiny, ductile, malleable, conductors |
| left to center of table / most elements | metals |
| non-metals | non-conductors, opposite of metals |
| metalloids | semi-conductors / properties of metals & non-metals |
| rows | periods |
| columns | groups / families |
| atomic number | number of protons |
| atomic mass | bottom number |
| number of p & n / mass of electrons | atomic mass |
| element | pure subs. / made of 1 type of atom |
| molecule | 2 or more atoms chemically combined |
| compound | 2 or more elements chemically combined |
