From which element in the modern periodic table, the 3d transition series starts?

Q. From which element in the modern periodic table, the 3d transition series starts?
Answer: Scandium
Notes: The 3d transition series starts from scandium (Z = 21) and completes at zinc (Z=30). Reason for this transition series is that before the 4p orbital is filled, filling up of 3d orbitals becomes energetically favourable.

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