Why is valency of iron 2 as well as 3

1.	Why is valency of iron 2 as well as 3
Answer» 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.

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