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E V (M3+/M2+)
A measure of the thermodynamic stability of different oxidation states of an element.
Sc3+
A cation of scandium that has a noble gas electron configuration and low E V value due to its stability.
Zn2+
A cation of zinc with a stable d10 electron configuration, whose removal of an electron results in the highest E V value.
Mn2+
A cation of manganese with a d5 configuration that is particularly stable, contributing to a comparatively high E V value.
Fe3+
A cation of iron that has extra stability due to its d5 configuration, resulting in a comparatively low E V value.
V2+
A cation of vanadium with a half-filled t2g level, which correlates with its comparatively low E V value.
Note 
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