Question

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

Answer 1

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.

Answer 2

Period no. = 1, Group no. = 18

Step-by-step 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.