MCQ
$Sc\, (Z = 21)$ is a transition element but $Zn\, (Z = 30)$ is not because
  • A
    both $Sc^{3+}$ and $Zn^{2+}$ ions are colourless and form white compounds.
  • in case of $Sc, 3d$ orbitals are partially filled but in $Zn$ these are filled.
  • C
    last electron is assumed to be added to $4s$ level in case of $Zn.$
  • D
    both $Sc$ and $Zn$ do not exhibit variable oxidation states.

Answer

Correct option: B.
in case of $Sc, 3d$ orbitals are partially filled but in $Zn$ these are filled.
b
Transition element are those in which second last shell is in completely filled.

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.

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