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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: - Which of the following is the most electropositive element
- The wrong statements about glycerol is
- An orbital in which n = 4 and l = 2 is expressed by
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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
- Which of the following is the most electropositive element
- The wrong statements about glycerol is
- An orbital in which n = 4 and l = 2 is expressed by
- Fusion mixture is
- Two possible stereo-structures of CH₃CHOHCOOH, Which are optically active are called
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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