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  4. Which of the following elements shows maximum number of different oxidation states in its compounds ?

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Q. Which of the following elements shows maximum number of different oxidation states in its compounds ?

AIPMTAIPMT 1998The d-and f-Block Elements

Solution:

Oxidation states shown by elements are as follows:
$La =+3$
Eu and $Gd =+2$ and $+3$
$A m=+2+3+4+5 $ and $+6$
Am shows maximum number of different oxidation state due to its larger size and low ionisation energy.