d - block and f - block Elements
Separation of lanthanides from their mixture is not easy because of:
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Single Choice
Reason of lanthanoid contraction is:
Anegligible screening effect of f orbitals.
Correct Answer
Bincreasing nuclear charge.
Cdecreasing nuclear charge.
Ddecreasing screening effect.
Solution
Reason of lanthanoid contraction is Negligible screening effect of f orbitals. hence, as the nuclear charge increases, the valence shell is pulled slightly towards nucleus. Thus the size of tripositive ion decreases with increase in the atomic number. This decrease is very small and u is known as lanthanide contraction. Hence, the correct option is $$A$$.
SIMILAR QUESTIONS
d - block and f - block Elements
Which of the following statements is not correct?
d - block and f - block Elements
What is the expression for the covalent radius of the following? Zr _____ Hf
d - block and f - block Elements
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d - block and f - block Elements
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d - block and f - block Elements
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d - block and f - block Elements
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d - block and f - block Elements
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d - block and f - block Elements
The separation of Lanthanoid elements is difficult. Explain.
d - block and f - block Elements
Which of the following factor may be regarded as the main cause of lanthanide contradiction?
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