Group of the transition metal.

3

4

5

6

7

8

9

10

11

12

Atomic no.

Symbol

21

Sc

22

Ti

23

V

24

Cr

25

Mn

26

Fe

27

Co

28

Ni

29

Cu

30

Zn

general electronic configuration of transition elements

3d ¹ s ²

3d ² s ²

3d ³ s ²

3d ⁵ s ¹

3d ⁵ s ²

3d ⁶ s ²

3d ⁷ s ²

3d ⁸ s ²

3d ¹⁰ 4s

3d ¹⁰ 4 ²