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.Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements

Posted by Jaynit Kumar 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 3 years, 9 months ago

The rules for writing of distribution of electrons in various shells for the first eighteen elements are:

(i) The maximum number of electrons present in a shell is formula—2n²

n = orbit number i.e., 1, 2, 3

Maximum number of electrons in different shells are:

K shell n = 1 2n² ⇒ 2(1)² = 2

L shell n = 2 2n² ⇒ 2(2)² = 8

M shell n = 3 2n² ⇒ 2(3)² = 18

N shell n = 4 2n² ⇒ 2(4)² = 32

(ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8.

(iii) Electrons are not accommodated in a given shell unless the inner shells are filled. (Shells are filled step-wise).

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