How many valence electrons does iron have?

Valence electrons are the electrons that present in the outermost shell of an atom. The electron configuration of Iron is written by knowing its atomic number is 26.

1s²2s²2p⁶3s²3p⁶4s²3d⁶

Here 4s²3d⁶ electrons are present in the outer shell of Iron which means that the valence electrons present in the Iron atom are Eight. It belongs to the 8th group in the periodic table.