The gaps on Mendeleev's table _____.
have never been filled in
represented elements not discovered in his time
are not filled in because those elements are gases
are not filled in because those elements keep changing
The gaps on Mendeleev's table represented elements not discovered in his time.
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selymi|Points 7372|
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Asked 1/30/2012 10:30:01 AM
Updated 8/31/2015 10:11:10 AM
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