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4 February, 00:41

In general, as you move from right to left across a period, the number of valence electrons

A : Increases

B : Stays the same

C : Increases and then decreases

D : Decreases

I already tried increases and it's wrong

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Answers (1)
  1. 4 February, 02:21
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    The answer is decreases. The noble gases (far right side) have a full valence shell. As you move left, the number of valence electrons decreases, which makes the elements on the left side more reactive.
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