1.

What are lanthanides and actinides?

Answer»

Solution :• In 4F series, 4f orbitals are being progressively filled with electrons, `4f^(1-14)5d^(0-1)-6S^(2)`. These elements lie in 6th period and are called rare earths or lanthanides or lanthanones.
• In 3F series, 5forbitals are being progressively filled with electrons, `5F^(1-14)6D^(0-1)-7s^(2)` These elements lie in 7th period and are called actinides or actonones.


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