Question

6. Summarise the rules for writing ot distribution of electrons in various shells for the first eighteen elements. ?
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Answer 1

Answer:

Explanation:

Solution

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.