| A | B |
|---|
| Alkali metal | Extremely reactive (Francium most reactive) |
| Alkaline Earth metal | 2 valence electrons /// less reactive than Alkali metals |
| Atomic Mass Unit | Used to measure the mass of subatomic particles. |
| Ductile | can be pulled into wire |
| Group (Family) | Columns; similar chemical properties & valence electrons |
| Halogens | Most reactive nonmetals; Fluorine |
| Malleable | Can be hammered without shattering |
| Noble Gases | Colorless, odorless, and un-reactive; 8 valence electrons (peace) |
| Metals | Good conductors, high melting point |
| Metalloids | Properties in between metals and nonmetals; semiconductors |
| Period | Rows; shows # of energy levels in elements |
| Periodic Law | Repeating properties found in the periodic table |
| Periodic Table | Arrangement of elements based on their atomic number and chemical properties |
| Transition metals | Their valence electrons vary; middle section of the periodic table |
| Transuranium elements | Elements made from Uranium; radioactive |
| Valence Electrons | Electrons in the highest energy level |
| Nonmetals | Poor conductors with low melting points |
| Mendeleev | Organized the periodic table based on mass |
