Question
How would you account for the following:
(i) Among lanthanoids, Ln (III) compounds are predominant. However, occasionally in solution or in
solid compounds, +2 and +4 ions are also obtained.
(ii) The EoM2+/M for copper is positive (0.34 V). Copper is the only metal in the first series of transition elements showing this behavior.
(iii) The metallic radii of the third (5d) series of transition metal are nearly the same as those of the corresponding members of the second series.