MCQ
Which of the following oxidation state is common for all lanthanoids?
- A+2
- B+3
- C+4
- D+5
✓
Answer
- +3
Explanation:
In the lanthanoids, La(II) and Ln(III) compounds are predominant species. However, occasionally +2 and +4 ions in solution or in solid compounds are also obtained. This irregularity (as in ionisation enthalpies) arises mainly from the extra stability of empty, half-filled or filled f subshell.
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