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Question
Write any two consequences of Lanthanoid Contraction.
Solution
- Due to the close similarity in electronic configuration and ionic radii, the lanthanides have identical chemical properties, which make their separation difficult.
- Due to lanthanide contraction, the size of Ln3+ ions decreases regularly with an increase in atomic number. According to Fajan's rule, a decrease in the size of Ln3+ ions increases the covalent character and decreases the basic character between Ln3+ and OH– ion in Ln(OH)3. Since the order of size of Ln3+ ions is La3+ > Ce3+ ... > Lu3+.
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