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METAL CATION AND THEIR COORDINATION NUMBER:

The number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex or coordination compound are known as Coordination number or Ligancy.

S.N.
Metal Cation
C.N.
Examples
1
Zn2+
4
[Zn(NH3)4]-
2
Cd2+
4
[Cd(CN)4]2-
3
Hg2+
4
[Hg(I)4]2-
4
Hg2+
3
[Hg(I)3]-
5
Cu1+
2
[Cu(CN)2]-
6
Cu1+
4
[Cu(CN)4]3-
7
Cu2+
4
[Cu(NH3)4]2+
8
Cu2+
5
[Cu(Cl)5]3-
9
Cu2+
6
[Cu(H2O)6]++
10
Ag1+
2
[Ag(CN)2]1-
11
Ag3+
4
[Ag(F)4]1-
12
Au1+
2
[Au(CN)2]1-
13
Au3+
4
[Au(F)4]3-
14
Ni2+
4
[Ni(Cl)4]2-
15
Ni2+
5
[Ni(CN)4]3-
16
Ni2+
6
[Ni(NH3)6]2+
17
Pd2+ /Pt2+
4
[Pd(Cl)4]2- , [Pt(NH3)4]2+
18
Pd4+ /Pt4+
6
[Pd(H2O)6]4+ , [Pt(NH3)4]2+
19
Co2+
4
[Co(SCN)4]2-
20
Co2+
6
[Co(H2O)6]3+
21
Co3+
6
[Co(NH3)6]3+
22
Rh3+
6
[Rh(F)6]3-
23
Ir3+
6
[Ir(F)6]3-
24
fe2+ /Fe3+
6
[Fe(CN)6]4- , [Fe(CN)6]3-
25
Mn2+
4
[Mn(Br)4]2-
26
Mn2+
5
[Mn(Br)5]3-
27
Mn2+
6
[Mn(NH3)6]2+
28
Sc3+
6

29
Ti3+
6

30
V3+
6

31
Cr2+
6

32
Cr3+
6


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