Q83 / 180 · NEET 2013 (Karnataka) · Chemistry

$\mathrm{Sc}(\mathrm{Z}=21)$ is transition element but $\mathrm{Zn}$ $(Z=30)$ is not because:

  • A
    both $\mathrm{Se}^{31}$ and $\mathrm{Zn}^{2 \prime}$ ions are colourless and form white compounds
  • Correct answer
    B
    in case of $\mathrm{Sc}, 3 d$ orbitals are partially filled but in $\mathrm{Zn}$ these are completely filled
  • C
    least electron is assumed to be added to $4 s$ level in case of $\mathrm{Zn}$
  • D
    both $\mathrm{Sc}$ and $\mathrm{Zn}$ do not exhibit variable oxidation

Solution

Scandium has incompletely filled $3 d$-orbitals hence it is transition element, while there are no incompletely filled $d$-orbitals in zinc.

Hence, the correct answer is option: 'B'.

Relevant Questions