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Across the lanthanide series, the radius of the M3+ ion falls over roughly which range?
A85 pm to about 50 pm
B86 pm to about 103 pm
C160 pm to about 159 pm
D103 pm to about 86 pm
Answer & Solution
Correct answer: D. 103 pm to about 86 pm
The La3+ ion is about 103 pm and the Lu3+ ion about 86 pm, showing the steady contraction.
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