2) shows the varying
trends The low value for Sc reflects the stability of Sc
3+ 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 Zn
2+ The
comparatively high value for Mn shows that Mn
2+(d
5) is particularly
stable, whereas comparatively low value for Fe shows the extra stability
of Fe
3+ (d
5)