- Aboth $Sc^{3+}$ 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.
- Clast electron is assumed to be added to $4s$ level in case of $Zn.$
- Dboth $Sc$ and $Zn$ do not exhibit variable oxidation states.
