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2014-12-07T22:15:25+05:30

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a. Lanthanides is the correct answer.
The elements in which electrons are progressively filled in 4f orbitals are called Lanthanides.
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2014-12-12T11:25:30+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The correct answer is (a) lanthanoids 

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