Which element exhibits a +7 oxidation state? | vedclass

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(A) For $d$-block elements,the maximum oxidation state is determined by the sum of $ns$ and $(n-1)d$ electrons.$(a)$ $Mn (25) = [Ar] 3d^{5} 4s^{2}$. M

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$Mn (25)$

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(A) For $d$-block elements,the maximum oxidation state is determined by the sum of $ns$ and $(n-1)d$ electrons.$(a)$ $Mn (25) = [Ar] 3d^{5} 4s^{2}$. Maximum $O$.$S$. $= 5 + 2 = +7$.$(b)$ $Cr (24) = [Ar] 3d^{5} 4s^{1}$. Maximum $O$.$S$. $= 5 + 1 = +6$.$(c)$ $Cu (29) = [Ar] 3d^{10} 4s^{1}$. Common $O$.$S$. $= +1, +2$.$(d)$ $Fe (26) = [Ar] 3d^{6} 4s^{2}$. Common $O$.$S$. $= +2, +3$.Thus,only $Mn$ exhibits a $+7$ oxidation state among the given elements.

Which element exhibits a $+7$ oxidation state?

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