JEE Main 2006 — D And F Block Elements Question with Solution
From: AIEEE 2006
Question
Lanthanoid contraction is caused due to :
Choose an option
Show full solutionCorrect option: D
Correct answer
Dthe imperfect shielding on outer electrons by 4f electrons from the nuclear charge
Step-by-step explanation
The main reason of lanthanide contraction is, poor shielding of 4f electrons on the outer most shell electrons. As f orbital is defused nature so shielding of 4f electron is imperfect that is why nucleus can attract outer most shell electron easily and the size of atom decreases.
In lanthanides, there is poorer shielding of electrons by electrons resulting in greater attraction of the nucleus over electrons and reduction of the atomic radii.
In lanthanides, there is poorer shielding of electrons by electrons resulting in greater attraction of the nucleus over electrons and reduction of the atomic radii.
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This is a previous-year question from JEE Main 2006, covering the D And F Block Elements chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.