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Periodic Table Vocab
| Question | Answer |
|---|---|
| Group | vertical columns on Periodic Table |
| Period | horizontal rows on Periodic Table |
| Principal Energy Level | "shell" of electrons |
| Valence shell | outermost layer of electrons; identified by period number |
| Valence electrons | electrons in outermost shell; bonding electrons |
| Octet rule | Valence shell can hold a maximum of eight electrons |
| Periodic Law | elements have a repeating (periodic) pattern of characteristics |
| Mendeleev | Organized first periodic table |
| Modern periodic table | organized by atomic number |
| Alkali Metals | group 1/1A metals |
| Alkaline Earth Metals | group 2/2A metals |
| Transition metals | "B group"; characterized by brightly colored ions and multiple oxidation states |
| Halogens | group 17/7A; only group to have all three states of matter |
| Noble Gases | group 18/0; nonreactive gases; full valence shell |