Answer:
The three rules are
(i) The maximum number of electrons present in a shell is
given by the formula 2n2, where 'n' is the orbit number or energy
level 1, 2, 3,.... therefore, the maximum number of electrons in different
shells are as fallows
First orbit or K shell = 2 x 12 = 2
Second orbit or L shell = 2 x 22 = 8
Third orbit or M shell = 2 x 32 = 18
Fourth orbit or N shell = 2 x 42 = 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.
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