On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

Explanation

E.C. `of_(21)` Sc =`1s^(2)2s^(2)2rho^(6)3s^(2)3rho^(6)3s^(2)3rho^(6)3d^(1)4s^(2)` In this E.C. 3d orbital have one electron in its ground state. That is why it is regarded as a transition element:
EC: of Zn = `1s^(2)2s^(2)2rho^(6)3s^(2)3rho^(6)3s^(2)3rho^(6)3d^(10)4s^(2)`Zn does not have partly filled d orbital in its ground state or in its excited state that is why it is not considered as a typical transition element