Question

how does the electronic configuration in atoms change 1.in a period from left to right ?2.in a group top to bottom?

Answer 1

The electronic configuration 

1. increases across a period from left to right

2. remains same in a group from top to bottom. 

Answer 2

Here is your Answer:

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1. Increase of 1 electron in the outermost shell from left to right
2. Increase in shell from top to bottom

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