Valence electron

[Chase Yonamine 1J]

How do you determine the number of valence electrons of elements in d block elements?

[amogha_koka3I]

The transition metals don't have a traditional method to identify valence electrons like the other groups, but I don't think we have gone over in class how to determine how many valence electrons each transition metal has.

[Rachana Jayaraman 1H]

The number of valence electrons in the d-block is usually the group number plus 2 (for the 2 electrons in the preceding s orbital) in the ground state. For example, scandium's configuration is [Ar]3d^14s^2, so it has 3 valence electrons. This may only work for the first 2 rows though because further down there are elements in the f-block.

[Brian Chhoy 4I]

The valence electrons for the elements in the d block are always the amount of electron in the outermost shell. For example, for Mn: [Ar] 4s^2 3d^5. There are 2 valence electrons because the 4th energy level is the outer most orbital.

[taywebb]

I'm still slightly confused. The solutions manual says that Mn has 7 valence electrons, but it is in the 7th group, so you're saying that it would have 9?