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  4. Which of the following shows maximum number of oxidation states :-

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Q. Which of the following shows maximum number of oxidation states :-

AIPMTAIPMT 2002The d-and f-Block Elements

Solution:

Each of the element in group $IIIB$ to $VIIB$ can show the maximum oxidation state equal to its group number. $Mn$ shows maximum number of oxidation states on the basis of following electronic configuration
${_{25}} Mn = 1s^2 , 2s^22p^6 ,3s^23d^5 ,4s^2(+7)$