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How would you account for the following: Among lanthanoids, Ln(III) compounds are predominant. However, occasionally in solution or in solid compounds, +2 and +4 ions are also obtained. |
| Answer» Solution :Lanthanoid METALS show +2 and +4 OXIDATION states in solution or in solid compounds to attain extra STABLE `f^0` and `f^7` and `f^(14)`configurations. For example, Eu and `Y_b` exhibit +2 oxidation states DUE to extra STABILITY of half-filled and completely filled 4f-subshell respectively. Ce and Tb exhibit + 4 oxidation states due to the extra stability of empty and half-filled 4f-subshell respectively. | |