On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?
On the basis of incompletely filled 3d orbitals in case of scandium atom is its ground state (3d1), it is regarded as a transition element. On the other hand, zinc atom has completely filled dorbitals (3d10) in its ground state as well as in its oxidised state, hence it is not regarded as a transition elements.
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