Question

What is the valency of iron and how does it come?I need full explanation.​

Answer 1

Answer:

Explanation:

When iron loses the 2 4s electrons, it attains a valency of +2. Sometimes, iron will also lose one of the paired electrons from 3d orbital, leaving the entire 3d orbital filled with unpaired electrons (which provides a more stable configuration). In this case, its valency will be +3.

Answer 2

valancy of iron is 3

and valency be calculated by

we write electronic configuration of iron then

you see the attachment figure