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Chemistry Praxis
Question | Answer |
---|---|
alkali metals | Group 1A. Soft, low-melting, reactive metals. Very reactive with H20. Abundant in Earth's crust. |
Alkaline earth metals | Group 2A. Less reactive than alkali. Also abundant in Earth's crust. |
Halogens | Group 7A. "salt-formers." Most reactive non-metals, decreasing down group. |
Nobel gases | Group 8A. Mostly inert, all gases at room temp. Xe, Kr, Rn Ar compounds made. |
Periods | Across the PT. Properties change, increasing atomic number. |
Groups | Columns of PT. Similar properties down the column. |
Metals | Shiny, good electrical conductors, most elements |
Nonmetals | Typically don't conduct electricity |
Metalloids | Have metal and nonmetal properties |
Transition metals | B groups (or 3-12) in center of PT. |