| A | B |
|---|
| H | Hydrogen |
| He | Helium |
| Li | Lithium |
| Be | Beryllium |
| B | Boron |
| C | Carbon |
| N | Nitrogen |
| O | Oxygen |
| F | Fluorine |
| Ne | Neon |
| Na | Sodium |
| Mg | Magnesium |
| Al | Aluminum |
| Si | Silicon |
| P | Phosphorus |
| S | Sulfur |
| Cl | Chlorine |
| Ar | Argon |
| rows | periods |
| columns | groups/families |
| periodic table | arrangements of elements according to atomic numbers |
| AMU | atomic mass unit |
| Periodic Law | Pattern of repeating properties |
| Symbols | capital then lower case letters |
| atomic mass | weighted averages |
| elements are classified | metals, metalloids, non-metals |
| very reactive metals | family#1 |
| elements that do not react | family #18 |
| very reactive non-metals | family #17 |
| has properties of metal and non-metal | metalloids |
| #of electrons in the last energy level | # of family |
| How many periods are there | 7 |
| #of energy levels | # of period |
| malleable | opposite of brittle |
| Mercury | liquid metal |
