Question

In the present periodic table containing 118 elements: How many lanthanides exist?

Answer 1

In a periodic table, elements are arranged in the increasing order of their atomic numbers.

• The lanthanide is a series of metallic elements located separately below the periodic table.
• The elements start from atomic number 57 and end with atomic number 71.
• The Lanthanide series starts from lanthanum to lutetium.
• Number of lanthanides = (71 - 57) + 1 (including the end element) = 15.

Fifteen lanthanides exist in a periodic table.