Transition Elements

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                           Transition elements periodic table

What are transition elements?

Transition elements or transition metals are those elements which have partially filled d-orbitals. Transition elements are also known as d-block elements. Transition elements occur from  21Sc to 112Cn, excluding lanthanides and actinides. Lanthanide and actinides are known as inner transition elements. Transition elements show transition from metals to non-metals in the periodic table, that’s why given the name transition elements. So, transition elements can be defined as the elements which placed in between the s-block and p-block elements in the modern periodic table. 

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Properties of transition elements – Transition elements properties can be defined by following points- 

1. Transition elements shows variable oxidation numbers and many valences. For example Ti shows +3 , +4 valences and Cr shows +2, +3, +4, +6 valences. 

2. These elements form co-ordination compounds or coordination complexes. 

3. These metals form coloured compounds. 

4. These metals show high melting and boiling points. 

5. These elements have high densities. 

6. These elements show catalytic properties. 

7. These elements generally form stable complexes. 

8. These elements have large charge and radius ratio. 


Transition elements series – d-block elements or transition elements are divided into following four series – 

1. First transition series 

2. Second transition series 

3. Third transition series 

4. Fourth transition series 

1. First transition series – 1st transition series includes elements from Sc to Zn present in the 4th period of periodic table. 

1st transition series elements - 

2. Second transition series – 2nd transition series includes elements from Y to Cd present in the 5th period of periodic table. 

2nd transition series elements - 

3. Third transition series – 3rd transition series includes elements from Hf to Hg present in the 6th period of periodic table. 6th period includes lanthanides also. Lanthanides are known as inner transition elements. 3rd transition series elements - 

4. Fourth transition elements – 4th transition series includes elements from Rf to Cn present in the 7th period of periodic table. 7th period includes actinides also. Actinides are also known as inner transition elements.

4th transition series elements – 


Transition elements list – 

Period 

Group 

Element (Symbol) 

Atomic number 

Electronic configuration 

4

3

Sc

21

3d14s2

4

Ti

22

3d2 4s2

5

V

23

3d3 4s2

6

Cr

24

3d4 4s2

7

Mn

25

3d5 4s2

8

Fe

26

3d6 4s2

9

Co

27

3d7 4s2

10

Ni

28

3d8 4s2

11

Cu

29

3d10 4s2

12

Zn

30

3d10 4s2

5

3

Y

39

4d1 5s2

4

Zr

40

4d2 5s2

5

Nb

41

4d4 5s1

6

Mo

42

4d5 5s1

7

Tc

43

4d5 5s2

8

Ru

44

4d7 5s1

9

Rh

45

4d8 5s1

10

Pd

46

4d10

11

Ag

47

4d10 5s1

12

Cd

48

4d10 5s2

6

4

Hf

72

5d2 6s2

5

Ta

73

5d3 6s2

6

W

74

5d4 6s2

7

Re

75

5d5 6s2

8

Os

76

5d6 6s2

9

Ir

77

5d7 6s2

10

Pt

78

5d9 6s1

11

Au

79

5d10 6s1

12

Hg

80

5d10 6s2

7

4

Rf

104

6d2 7s2

5

Db

105

6d3 7s2

6

Sg

106

6d4 7s2

7

Bh

107

6d5 7s2

8

Hs

108

6d6 7s2

9

Mt

109

6d7 7s2

10

Ds

110

6d8 7s2

11

Rg

111

6d9 7s2

12

Cn

112

6d10 7s2