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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
- In liquid-gas equilibrium,the pressure of vapours above the liquid is constant
- p-type silicon is formed by adding a minute amount of an element with
- Which of the following statement regarding hydrogen peroxide is false
- If the dispersed phase is a liquid and the dispersion medium is solid,the colloid
- For the equilibrium, H₂O(l) ⇌ H₂O(g) at 1 atm and 298 K,
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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