Scandium has incompletely filled 3d-orbitals hence it is transition element, while there are no incompletely filled d-orbitals in zinc.
Sc(Z=21) is transition element but Zn (Z=30) is not because:
Held on 30 Apr 2013 · Verified 9 Jul 2026.
both Se31 and Zn2′ ions are colourless and form white compounds
in case of Sc,3d orbitals are partially filled but in Zn these are completely filled
least electron is assumed to be added to 4s level in case of Zn
both Sc and Zn do not exhibit variable oxidation
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