3 7 Trends in
Stability of
Higher
Oxidation
States
+ 6
CrF6
+ 5
VF5
CrF5
+ 4
TiX4
VX
I
4
CrX4
MnF4
+ 3
TiX3
VX3
CrX3
MnF3
FeX
I
3
CoF3
+ 2
TiX2
III
VX2
CrX2
MnX2
FeX2
CoX2
NiX2
CuX2
II
ZnX2
+ 1
CuX
III
Oxidation
Number
Table 4 5: Formulas of Halides of 3d Metals
Key: X = F ® I; XI = F ® Br; XII = F, CI; XIII = CI ® I
Rationalised 2023-24
100
Chemistry
and the same applies to CuX On the other hand, all Cu
II halides are
known except the iodide