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Which one of the following is a correct electronic configuration of Sodium?
(a) 2, 8
(b) 8, 2, 1
(c) 2, 1, 8
(d) 2, 8, 1
Answer :
(d) 2, 8, 1
EXPLANATION
The atomic number of sodium is 11.
11 electrons are distributed as follows:-
K-shell has 2 electrons; L-shell has 8 electrons; M-shell has 1 electron