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Question

The maximum number of electrons in a shell can be calculated by the formula _______.
  1. n2
  2. n
  3. 2n
  4. 2n2


Solution

The correct option is D 2n2
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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