Does all transition metals have their n2 and ( n-1)d orbitals as valence electrons?
I have been scouring the internet to the answer of this question but have mixed results.
Iron has an electron configuration of: 1s2,2s2,2p6,3s2,3p6,4s2,3d6
Aparantly it has 8 valence electrons because 4s2 + 3d6 =...