Find the valency of Iron by electronic configuration
Hi,
You have studied about the electronic configuration on the basis of K, L M and N shells.
These shells further have sub shells s, p, d and f and it is easier to find the valency using the electronic configuration based on these sub shells.
Also, these sub shells are stable when they are fully or half filled.
Like p sub shell is stable when it has 3(half filled) or 6 (fully filled) electrons.
The electronic configuration of iron is 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6
Thus the valence electron is 4s2, 3d6
Iron has +2 valency when it loses its 4s electron and +3 valency when its two 4s electron and one p electron.
On basis of this we say, the valency of iron is +2 and +3
You will study in detail about these sub shells in higher classes.
@Afzal
Good effort. Keep posting!
Best Wishes