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

Harshit Singh
2 months ago
Dear Student

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).

Thanks