| A | B |
|---|
| Francium | most active metal |
| Fluorine | most active non metal |
| Oxygen | combines with elements to make oxides |
| Sodium | combines with Chlorine to make table salt |
| Alkali metals | Family 1 |
| Alkaline earth metals | Family 2 |
| Halogens | Family 17 |
| Noble gases | Family 18 |
| Metalloids | found along metal/non metal boundary |
| Metals | majority of periodic table contents |
| Lanthanide series | atomic numbers 57 - 71 |
| Actinide series | atomic numbers 89-103 |
| Periods | horizontal rows of elements |
| Families | vertical columns of elements |
| atomic number | protons |
| atomic mass | average of atom's isotopes |
