In the present periodic table containing 118 elements:
How many elements belong to the third group?
So, according to the periodic table:
Four elements belong to the third group.
How many elements belong to the third period?
In the present periodic table containing 118 elements: How many zero group elements exist?
In the present periodic table containing 118 elements: How many transuranic elements exist?
In the present periodic table containing 118 elements: How many lanthanides exist?
In the present periodic table containing 118 elements: How many alkali metals exist in a periodic table?