1.

Which of the following is the correct electronic configuration of Sc (Z = 21)? (a) [Ar] 3d3 (b) [Ar] 3d’ 4s2 (c) [Ar] 3d2 4s1 (d) [Ar] 4s2 4p’

Answer»

(b) [Ar] 3d’ 4s2



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