Question

chemical property of helium

Answer 1

Helium has many unique properties: low boiling point, low density, low solubility, high thermal conductivity and inertness, so it is use for any application which can explioit these properties. Helium was the first gas used for filling balloons and dirigibles.

Answer 2

#it is lighter than air
#it is inert gas so it won't react with other elements generally