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| • | _______:
(families) are the columns of |
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| elements. The
elements in the groups have |
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| similar chemical
properties and predictable |
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| trends in
physical properties. |
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| • | Groups also have
labels. Group A elements |
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| are the
_____________ elements and the |
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| Group B are the
___________ elements. |
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| • | Note that there
is another way of labeling |
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| the groups with
nos. 1-18. |
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