Hydrogen and Helium ideal gas behavior in room temperature Which one of hydrogen and helium behaves more like ideal gas in room temperature...

I thought hydrogen gas would show more ideal behavior in room temperature because it has lighter mass (less no of electron) although it's diatomic, so there would be less attraction.
However, I saw one question on the book and they said that the helium gas is more likely to show the ideal gas behavior in room temperature, not the hydrogen gas..

So, can someone please give me an idea how my thinking is wrong?.

Thanks for advance
For inert gas molecules, intermolecular interactions would be by Van der Waals forces, which are based on the total volume and polarizability of the gas molecule. 

The diatomic hydrogen is larger and more polarizable of the two.