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) The correct electronic configuration of sodium is 2, 8, 1.
(b) 2, 8, 4
(c) 2, 8, 8
(d) 2, 8, 7