The tetrahedral [MO4]
n-
ions are known for V
V, Cr
Vl, Mn
V, Mn
Vl and Mn
VII + 7
Mn2O7
+ 6
CrO3
+ 5
V2O5
+ 4
TiO2
V2O4
CrO2
MnO2
+ 3
Sc2O3
Ti2O3
V2O3
Cr2O3
Mn2O3
Fe2O3
Mn3O4
*
 Fe3O4
*
Co3O4
*
+ 2
TiO
VO
(CrO)
MnO
FeO
CoO
NiO
CuO
ZnO
+ 1
Cu2O
Table 4 6: Oxides of 3d Metals
*
mixed oxides
Groups
3
4
5
6
7
8
9
10
11
12
Oxidation
Number
Intext Question
Intext Question
Intext Question
Intext Question
Intext Question
4 5 How would you account for the irregular variation of ionisation
enthalpies (first and second) in the first series of the transition elements