Q.18:- 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
(d) Atomic number of sodium (Na) =11
Its electronic configuration = 2, 8,1
Thus, (d) is correct.
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