How does the electronic configuration in atoms change.(i) in a period

1.	How does the electronic configuration in atoms change.(i) in a period from left to right?(ii) in a group top to bottom?
Answer» (i) Though the number of shells remain the same, number of valence electrons increases by one, as we move across any given period from left to right. (ii) While going from top to bottom in a group, the number of shells increases successively i.e. one by one but the number of valence electrons remains the same.

How does the electronic configuration in atoms change.(i) in a period from left to right?(ii) in a group top to bottom?

Answer»

(i) Though the number of shells remain the same, number of valence electrons increases by one, as we move across any given period from left to right.

(ii) While going from top to bottom in a group, the number of shells increases successively i.e. one by one but the number of valence electrons remains the same.

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How does the electronic configuration in atoms change.(i) in a period from left to right?(ii) in a group top to bottom?

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