Question

Give definition of Lanthanide series

Answer 1

Lanthanides are the Rare-Earth elements. They are a group of elements from Lanthanum (Atomic number 57) to Lutetium (Atomic number 71). So, there are 15 elements in the Lanthanide Series. Each element in the Lanthanide Series has a valency of +3. But some of the elements in the Lanthanide series have multiple possible valencies (ranging from +2 to+4) including the valency of +3. The Lanthanides are not found in large quantities and are expensive. All the elements of the Lanthanide Series arefound naturally, excluding Promethium. The Lanthanides have multiple uses is industries. For instance, Neodymium, a Lanthanide, is used tomake hyper attractivemagnets. Almost all the Lanthanide elements have some or the other uses in industries.

Answer 2

Answer:

the series involving the fitting of 4f orbital following lanthaniode la (z=57) is called infinite series