Question

what are rare group elements ​

Answer 1

These elements not much useful in reactions

Answer 2

Rare Earth Metals are any of the metallic elements within Group 3 in the Periodic Table (see the List of Rare Earth metals). Rare Earth metals are a set of 17 chemical elements in the periodic table, specifically the fifteen lanthanoids plus scandium and yttrium. All lanthanoids are relatively soft and reactive metals.

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