EASY
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Among the following statements, for what the lanthanoid contraction is responsible?

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Important Questions on d- and f-Block elements

MEDIUM
Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Number in the parenthesis are atomic numbers).
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Zr(Z=40) and Hf(Z=72) have similar atomic and ionic radii because of:
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What is lanthanide contraction? Why actinide contraction is greater from element to element that lanthanide contraction ?
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Give reasons for the following: There is a steady decrease in atomic or ionic radii of lanthanides from lanthanum to lutetium.
HARD
What is lanthanide contraction? Write any two of its consequences.
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Which out of La(OH )3and Lu(OH )3 is more basic and why ?

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Members of second and third transition series exhibit similar atomic radii, explain.