Unit 1b: Periodic Table and Trends
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6 Terms
1
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Organization of the Periodic Table
the elements into periods (rows) and groups (columns) by increasing atomic number. elements with similar properties are in the same group
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Trends: atomic radius
increases down a group, decreases across a period
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Trends: ionic size
size generally increases going down a group and decreases going across a period
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Trends: electron affinity
increases across a period, decreases down a group
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Trends: ionization energy
increases across a period, decreases down a group
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Trends: reactivity of metals/nonmetals
metals: increases by group, decreases by period
nonmetals: decreases by group, increases by period
Note 
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