Question

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what are lanthanoids............?​

Answer 1

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Lanthanoids cause the atomic radii of elements after them to be much lower than expected, due poor 4f-orbital shielding. This is called lanthanide contractions.

OR

Lanthanoid, also called lanthanide, any of the series of 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57–71). With scandium and yttrium, they make up the rare-earth metals

Answer 2

Answer:

any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table (atomic numbers 57–71).

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