WHY THE M SHELLS IS CAN ACCOMMODATE 18 ELECTRONS BUT IT DOSE'NT CONSTITUTE MORE THAN 8 ELECTRONS FOR ELEMENTS HAVING ATOMIC NUMBER MORE THAN 18?

The solution is as follows:

1. According to Bohr's rule:

      There cannot be more than 8 electrons in the anti-valence shell of any atom.

2. Thus, if have to fill 18 electrons in an atom, electronic configuration is as follows:

            2,8,8

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