Chemistry
Sakowicz
18

When Mendeleev organized elements in his periodic table in order of increasing mass, elements with similar properties were in the same __________.

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(1) Answers
TarTar

Mendeleev arranged the elements in rows in order of increasing mass so that elements with similar properties were in the same column.  So, the answer will be When Mendeleev organized elements in his periodic table in order of increasing mass, elements with similar properties were in the same Column.

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