D and F block elements

Question

What are lanthanoids

Answer 1

A lanthanide, also called lanthanoid, is 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

These are the inner transition elements or f-block elements:
The lanthanoids are present in the 6th period of the periodic table. The lanthanide series consists of a total of 14 elements from (Cerium) 58Ce to (Leuterium) 71Lu. They are also called as lanthanoids or rare earth elements as they occur scarcely in the earth's crust.
In general, their outermost
Electronic configuration is 4f 1 - 14 6s 2.
Due to lanthanoid contraction, there is a gradual decrease in atomic and ionic radii with an increase in atomic number. The lanthanoids exhibit mainly +3 oxidation state. However, sometimes +2 and +4 oxidation states are also exhibited.

answered by allu balaji