Question

What is the electron configuration of a ground-state fe2+ ion? Select one:

a. [ar]3d5

b. [ar]4s13d5

c. [ar]3d6

d. [ar] 4s14d5

e. [ar]4d6?

Answer 1

D as argon= 1s2 2s2 2p6 3s2 3p6 and after 3p6 subshell comes the 4d subshell which will contain 6 electrons