JEE Advanced Chemistry question
Consider the following statement I. The size of the lanthanide ions decreases as the atomic number of M increases. II. Electronic spectra of lanthanides show very broad bands. III. As with transition metals, coordination number six is very common in lanthanide complexes. Which of the statements given above is/are correct?
Answer: (A)
Solution
Statement I is correct — this is simply the lanthanide contraction, the steady decrease in ionic radius across the series as increasing nuclear charge pulls the poorly-shielded electron cloud inward. Statement II is incorrect: because the orbitals are deeply buried and well shielded by the filled
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