Chemistry - f-block Question with Solution | TestHub

$\mathrm{Eu}(\mathrm{z}=63)=4{\mathrm{F}}^{7}6{\mathrm{s}}^2$
$\mathrm{Dy}(\mathrm{z}=66)=4{\mathrm{F}}^{10}6{\mathrm{s}}^2$
$\mathrm{Tb}(\mathrm{z}=65)=4{\mathrm{F}}^{9}6{\mathrm{s}}^2$
$\mathrm{Ce}\left(58\right)=4{\mathrm{F}}^{1}5{\mathrm{d}}^{1}6{\mathrm{s}}^2$
$\mathrm{Dy}, \mathrm{Tb}$and$\mathrm{Ce}$show$+4$oxidation state while$\mathrm{Eu}$do not show$+4$oxidation state.