d and f block para 4

An examination of the E V (M3+/M2+) values (Table 8.2) shows the varying trends. The low value for Sc reflects the stability of Sc3+ which has a noble gas configuration. The highest value for Zn is due to the removal of an electron from the stable d 10 configuration of Zn2+. The comparatively high value for Mn shows that Mn2+(d 5 ) is particularly stable, whereas comparatively low value for Fe shows the extra stability of Fe3+ (d 5 ). The comparatively low value for V is related to the stability of V2+ (half-filled t2g level