# What is the degrees of freedom of helium gas ?

thereddevils
what is the degrees of freedom of helium gas ?

shouldn't helium gas be diatomic ? If so , it will be 5 .

i have problems differentiating monoatomic and diatomic . Though its obvious that mono is one atom and diatomic is 2 atoms . Is it possible to know whether its mono or diatomic from the periodic table ?