Question

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 1

Answer:

because AL reacts with some other substances

Answer 2

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Lanthanoids exhibit occasionally +2, +4 ions because of extra stability of empty, half-filled and completely filled 4f- subshell respectively i e, 4f0,4f7 , 4f14 configuration.

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