Why do the properties of elements change in a regular way across a period

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asked Jun 15, 2016 48.0k views

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Zrii · Answer 1 · 2016-06-22T16:00:02+0000

Because as we go across the periods, groups are increasing. And in each group their are different valence electrons. The valence electrons determine the elements properties.

Why do the properties of elements change in a regular way across a period

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