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

How would you account for the following : (i) Among lanthanoids,Ln(II

1.	How would you account for the following : (i) Among lanthanoids,Ln(III) compounds are predominant. However,occasionally in solution or in solid compound,+2 and +4 ions are also obtained. (ii) The E_(M^(2)//M)^(@) for copper is positive (0.34 V) copper is the only metal in the first series of transition elements showing this behaviour. (iii) The metallic radii of the third (5d) series of transition metals are nearly the same as those of the corresponding member of the second series.
Answer» SOLUTION :N//A