In $S{c}$, the $e^{-}$ configuration is $3 d^{1} 4 s^{2}$
wheareas in $Z{n}$ configuration is $3 d^{10} 4 s^{2}$
$\therefore \,\ln \,Z{n}$, the $3 d$ leaving completely filled, its not a transtion element.
(પરમાણ્વીય ક્રમાંક: $Ce = 58, Sm = 62,$$ Eu = 63, Yb = 70$)