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The lanthanide contraction is due to: (a) filling of 5d before 4f (c) filling of 4f before 5d 10) 9) (b) filling of 4d before 4f (d) filling of 4f before 4d ln
The lanthanide contraction is due to: (a) Filling of 5d before 4f (c) Filling of 4f before 5d 10) 9) (b) Filling of 4d before 4f (d) Filling of 4f before 4d Ln (trivalent lanthanide ions) have electroni configuration.
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Priyanshu kumar Best Answer
Lanthanoid contraction effect results from poor shielding of nuclear charge (nuclear attractive force on electrons) by 4f electrons (filling of 4f is done before 5d); the 6s electrons are drawn towards the nucleus, thus resulting in a smaller atomic radius.
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4f before 5d...option C
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Dinesh khalmaniya 1![best-answer]()
option C Cause. The effect results from poor shielding of nuclear charge (nuclear attractive force on electrons) by 4f electrons; the 6s electrons are drawn towards the nucleus, thus resulting in a smaller atomic radius.