2 years ago

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

Biology

2 answers:

Alex Ar [27]2 years ago

5 0

Answer:

hey.

Explanation:

irinina [24]2 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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