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  4. Common oxidation state of f -block elements is III. The other stable oxidation states of 63 Eu and 65 Tb are respectively

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Q. Common oxidation state of $f$ -block elements is $ III$. The other stable oxidation states of ${ }^{63} Eu$ and ${ }^{65} Tb$ are respectively

TS EAMCET 2019

Solution:

Common oxidation state of $f$ - block elements is $(+) 3$, but $Eu$ and $Tb$ can also show $(+) 2$ and $(+) 4$ oxidation states respectively because of $4 \,f^{7}$ and $4\, f^{9}$ electrons in $4\,f$ -subshell respectively.