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Periodic Table/Calculations
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| A | B |
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| Group/family | vertical columns (7) |
| average atomic mass calculation | add protrons and neutron number |
| Period/Series | horizontal rows (18) |
| Semimetals/metalloids | properties of both metals and non metals, step ladder inbetween metals and nonmetals, nonmetals on the right, left-metals |
| Metals | good conductors of electricity and heat, malleable, shine, solids, room temp, |
| nonmetals | poor conductors of heat and electricity, one nonmetal -bromine-liquid, rest solid, many gases, some color, |
| temperature conversions | K= C+273, C=K-273 |
| halogen | group 7 |
| noble gases | group 18, no charge |
| alkali metals | group 1, like most metals, soft enough to be cut by knife, react with air and water, |
| periodic trends | center of atom to end, increase going down, decrease l2r |
| electron affinity | energy gained when electron added |
| valence electron | outer most electron |
| ionization energy | remove electrons decrease going down, increase l2r |
| alkaline earth metals | group 2, high density and melting point, not as reactive as alkai metals, not found in nature, 2 valance electrons, 2+ charge |
| atomic radius | center of atom to end, increase going down, decrease l2r |
| Electronegativity | decreas going down, increases l2r, reflects ability to attract electrons chemical bond |
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