Among lanthanoids, Ln(III) compounds are predominant. However, occasionally in solutions or in solid compounds, +2 and +4 ions are also obtained. Give reason. [AI 2012]

Among lanthanoids, Ln(III) compounds are predominant. However, occasio

1.	Among lanthanoids, Ln(III) compounds are predominant. However, occasionally in solutions or in solid compounds, +2 and +4 ions are also obtained. Give reason. [AI 2012]
Answer» because AL REACTS with some other SUBSTANCES