Question

@shiksha191551
please explain this​

Answer 1

There is formula for,

2(n)(n)

So there are 4 shells

KLMN

In these shells electrons are distributed.

First shell is K shell,In K shell only 2 elctrons can be filled etc.....

In modern periodic table first period has 2 elements so it is very short period

etc.....

Seventh period is an incomplete period because some of the elements are placed in the lathanide and actnide series

Hope it helps

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