Question

Why the valency of IRON varies ?​

Answer 1

So, iron having atomic number 26. It has two electrons in its 4s orbital and 6 electrons in its 4d orbital. In order to attain stability it looses it two electrons in the 4s orbital and hence have +2 valency and since the half filled orbitals are more stable it loses one more electron from d orbital and has +3 valency.

Answer 2

I THINK ......

BECAUSE OF ITS ISOTROPIC FORMS OR BECAUSE OF ITS TRANSITIONARY PROPERTIES......