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Iron has +2 valency ..................................................................
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   Iron  (Fe)  has a valency of  2.  as per the number of electrons in the 4s orbital.  Iron exists with a valency of  2, 3, 4, 5 in many compounds.  Most stable ones are those with Iron in an oxidation state of  2  : Fe(II)  or  3  : Fe(III).

In Fe²⁺ ,  the outermost orbital electrons are given out. 
In Fe³⁺  , the 3d orbitals will have all 5 unpaired electrons. 

Fe has  an atomic number Z of  26. configuration is :
   1s²  2s²  2p⁶  3s²  3p⁶   3d⁶  4s²

We find Iron in an oxidation state of 2 , in Ferrous Sulphate : Fe SO₄ , Ferrous oxide : Fe O

In an oxidation state of  3, in Ferric chloride  Fe Cl₃  , Ferric oxide:  Fe₂ O₃

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