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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.
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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
- If the ratio of the rates of diffusion of two gases A and B is 4 : 1. Then the ratio
- Which of the following hormones is produced under the conditions of stress
- Which of the following electronic configuration an atom has the lowest ionisation
- The IUPAC name of tertiary butyl chloride is
- AgNO₃ does not give precipitate with CHCl₃ because
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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