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Lanthanide contraction is due to increase in
Options
(a) shielding by 4f electrons
(b) atomic number
(c) effective nuclear charge
(d) size of 4f orbital
Correct Answer:
effective nuclear charge
Explanation:
As we move through the lanthanide series. 4f electrons are progressively filled. The mutual shielding effect of electrons is very little, being even smaller than that of d electrons.The nuclear charge however increases by one at each step increasing the inward pull experienced by the 4f electrons and hence the reduction in the size of the 4f(n) shell. Sum of the successive reductions gives the total lanthanide contraction.
Related Questions: - The empirical formula of an acid is CH₂O₂ , the probable molecular formula of
- Which one of the following has an aromatic character
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Topics: D and F Block Elements
(91)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The empirical formula of an acid is CH₂O₂ , the probable molecular formula of
- Which one of the following has an aromatic character
- In which type of reaction oxygen is converted into ozone
- The percentage weight of Zn in white vitriol [ZnSO₄ 7H₂O] is approximately equal
- In alkaline hydrolysis of a tertiary alkyl halides by aqueous alkali,
Topics: D and F Block Elements (91)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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