Question

Why Fe has many valency?

Answer 1

Hi


valency is the measure of combining power with other elements.

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.

so it have many valency...

hope it helps you

Answer 2

Fe is transition element or d- block element (having valence electron in d-sub shell) ,its outer s,p and d have almost nearly  have same energy .Electron  of transition element move back and forth in these orbits  to achieve stabilize configuration giving variable valency ( in case of iron +2 & +3 valency )