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

Posted by Sweetu Patel 3 years, 8 months ago

CBSE > Class 09 > Science

2 answers

Diya Bj 3 years, 8 months ago

1)The maximum number of electrons that can be accommodated in a shell can be determined by the formula 2n^2.The maximum number of electrons that can be accommodated in different shells are as follows; 1st orbit or K shell 2*1^2=2,2nd orbit or L shell=2*2^2=8,3rd orbit or M shell=2*3^2=18 and so on.The maximum number of electrons that can be accommodated in the outermost shell is 8.Electrones are filled in a step-wise manner.

Sweetu Patel 3 years, 8 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 given by the formula-2 n2 ∵ 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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