The 3d transition series starts from which atomic number?


The 3d transition series starts from scandium whose atomic number is 21 after calcium whose atomic number is 20.

  • The first transformation series is the 3d series.
  • As a consequence, the 3d array includes elements with atomic numbers ranging from 21 to 30.

Electronic configuration of 3d series elements

Transition Elements Atomic Number Electronic Configuration
Sc 21 [Ar] 3d1 4s2
Ti 22 [Ar] 3d2 4s2
V 23 [Ar] 3d3 4s2
Cr 24 [Ar] 3d5 4s1
Mn 25 [Ar] 3d5 4s2
Fe 26 [Ar] 3d6 4s2
Co 27 [Ar] 3d7 4s2
Ni 28 [Ar] 3d8 4s2
Cu 29 [Ar] 3d10 4s1
Zn 30 [Ar] 3d10 4s2

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