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17 Cards in this Set
- Front
- Back
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Period |
One of 7 rows on P.T. |
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Periodicity |
Any repeating pattern |
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Group |
One of 18 columns on P.T. |
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Alkali Metals |
Group 1; soft and very reactive |
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Alkaline Earth Metals |
Group 2; somewhat soft and reactive metals |
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Halogens |
Group 17; poisonous because very reactive |
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Noble (inert) gases |
Group 18; very unreactive |
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Periodic Law |
When elements are arranged according to increasing atomic number (mendeleev originally used atomic mass), then their properties recur periodically |
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Transition metals |
Groups 3-12 on P.T. |
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Lanthanide Series |
Elements 57-71; can be seen as stacked vertically in group 3 |
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Actinide Series |
Elements 89-103; can be seen as stacked vertically in group 3 |
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Electrical force |
An electrically attractive or repulsive force between charges. Fele increases with magnitude of charge (q), but decreases with distance (d) squared between them Fele=k•q1•q2 ÷ d2 |
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Shielding effect |
(-) inner electrons repel (-) valence electrons; this tends to make atoms larger than expected and their I.E. less than expected |
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Ionization energy (I.E.) |
Energy required to remove a valence electron from an atom of gas |
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First ionization energy |
The energy required to remove the 1st valence electron from an atom of gas |
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Isoelectronic |
Atoms or ions with the same number of electrons |
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Metallics properties |
Conductors of heat and electricity, malleable, ductile, shiny, relatively high m.p. and b.p. |
