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How does the number of valence electrons for elements change across a period

User Pranav
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do u have any answers so i can choose n help u out

User Michael Bruyninckx
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They increase in number as you go left to right, but the reactivity decreases as you go left to right. As you go down the table, the nuclear charge increases, but then so does the number of shielding electrons.
User Tsutomu Kawamura
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