Which of the following electron configurations is correct for the aqueous iron 2+ ion?

W) [Ar] 4s\({}^{2}\) 3d\({}^{4}\)

X) [Ar] 4s\({}^{1}\) 3d\({}^{5}\)

Y) [Ar] 3d\({}^{6}\)

Z) [Ar] 3d\({}^{5}\) 4p\({}^{1}\)
Y) [Ar] 3d\({}^{6}\)