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  4. The elements in which electrons are progressively filled in 4f orbital are called

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Q. The elements in which electrons are progressively filled in 4f orbital are called

KCETKCET 2019The d-and f-Block Elements

Solution:

In lanthanoids, electrons are progressively filled in $4 f$ orbital. The general electronic configuration for lanthanoids is $[ Xe ] 4 f ^{1-14} 5 d ^{0-1} 6 s ^{2}$