account for the difference in size of Fe3+ and Fe2+
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fe2+ have greater syz bcoz it loose it's 2 electron so force of repulsion is greater than fe3+ bcoz it loose it's 3 electron...
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Consider the electronic configuration of Fe2+[Ar] 3d6 and Fe3+[Ar] 3d5 (For comparison, Fe [Ar] 4s2 3d6). Fe3+ ionic radius is 63 pm, while Fe2+ has an ionic radius of 77 pm. (For comparison, the Fe atom has a radius of 140 pm). This is because the outermost electron in the Fe2+ ion is pulled off to form Fe3+ ion.
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