Question

Summarise the

Rules for writting the
distribution of electrons in various
Shells for first eighteen elements?​

Answer 1

Answer:

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Explanation:

the following rules are followed for writing the number of electrons in different energy levels or shells.

(i) the maximum number of electrons presents in a shell is given by the formula 2n

2

where

′

n

′

is the orbit number of energy level index 1,2,3... hence the maximum number of electrons in different shells are as follows :

First orbit or K-shell will be =2×1

2

×2 Second orbit or L shell will be =2×2

2

=8 third orbit or M shell will be =2×3

2

=18 fourth orbits or N-Shell will be =2×4

2

=32 and so on.

(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. That is the shells are filled in a stepwise manner.

Answer 2

Question :-

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

Answer :-

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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