| ⇦ | 
| ⇨ |
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: - Enzymes with two sites are called
- If 200 mL of gas at 27°C is cooled to 7°C at constant pressure, its final volume will be
- The carboxylic acid of least strength among the following is
- In which of the following pairs, the two species are iso-structure?
- Hereditary characteristic are passed on from parents to chlidren through
Topics: D and F Block Elements
(91)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Enzymes with two sites are called
- If 200 mL of gas at 27°C is cooled to 7°C at constant pressure, its final volume will be
- The carboxylic acid of least strength among the following is
- In which of the following pairs, the two species are iso-structure?
- Hereditary characteristic are passed on from parents to chlidren through
Topics: D and F Block Elements (91)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply