$Sc\, (Z = 21)$ is a transition element but $Zn\, (Z = 30)$ is not because

  • [NEET 2013]
  • A

    both $Sc^{3+}$ and $Zn^{2+}$ ions are colourless and form white compounds.

  • B

    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.

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