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Question


The maximum number of electrons in a shell can be calculated by the formula _______.


Options:
A .   n2
B .   n
C .   2n
D .   2n2
Answer: Option D
:
D
The maximum number of electrons present in a shell is given by the formula 2n2, where ‘n’ is always natural number.
n represents the principal quantum number. It represents the size and the energy of the shell. 
Hence, the maximum number of electrons in different shells are as follows:

1. First orbit or K-shell (n=1)  = 
2x12 = 2
2. Second orbit or L-shell (n=2)  =
2x22 = 8
and so on.



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