1. Which element has the following electron configuration?
(a) [He]2s1 _________
(b) [He]2s22p3 _________
(c) [Ne]3s23p3 _________
(d) [Ar]4s13d10 _________
(e) [Ar] 4s23d104p6 __________
(f) [Ar]4s13d5 ___________
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