What is the period number in which helium is found? What is the group name in which helium is found?

Period no. = 1, Group no. = 18

Explanation:

Atomic number of He = 2

Helium is placed in period 1 and group 18.

Helium is an inert gas and also known noble gas.

Helium is the first element placed in group 18.

Helium is a colourless, odder-less gas. Its outer shell (K shell) is fully occupied and so has inert gas configuration.

Because of inter gas configuration, it is chemically inactive.

Helium is found in the 1st period of the periodic table. It also is part of the noble gases group in the last column (18th) of the table.