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OverLord2011 [107]
3 years ago
6

Elements are placed into the same period on the periodic table of the elements because they ___________.

Biology
2 answers:
Alex Ar [27]3 years ago
5 0

Answer:

hey.

Explanation:

irinina [24]3 years ago
5 0

Answer:

Have the same number of electron energy levels

Explanation:

Like, every element in the top row has one electron, the second row has two electrons, etc.

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