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What is lanthanoid contraction ? What ar...

What is lanthanoid contraction ? What are the consequences of lanthanoid contraction?

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Lanthanide contraction: Slow decrease in size of the atoms or ions among the lanthanides is known as lanthanide contraction.
Consequences due to lanthanide contraction:
(1) Due to lanthanide contraction, the crystall structure and other properties of the elements become very closely similar.
(2) Due to this, it becomes difficult to separate lanthanides from a mixture.
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