Question

In what period do the elements in the lanthanide series belong?

Answer 1

Their own special ones.......

Explanation:

Lanthanides and actinides are always assigned their own special Periods in the Periodic Table. Many inorganic chemists refer to them as the `"f-element metals"`. Because, `"scandium,"` `"ytrrium,"` and `"lanthanum"` have very similar chemistry, their chemistry is often considered under the same umbrella.