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What is lanthanide contraction? Give one...

What is lanthanide contraction? Give one of its consequences.

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Lanthanide contraction: Show 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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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Very Short Answer Questions
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  3. What is lanthanide contraction? Give one of its consequences.

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  11. Select in each pair, the one having lower ionization energy and explai...

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  13. Select in each pair, the one having lower ionization energy and explai...

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  20. Which in each has higher electron affinity? (b) O or O^(-)

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