system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why does Helium have a lower melting point than Hydrogen?

Pure hydrogen is less dense than pure helium. Why does it have a higher melting point?
gpt
Because density doesn't really change anything - it's about how much the molecules are attracted to each other. Helium is a noble gas, with its whole outer electron shell full, and so it has very little intermolecular attraction - less than hydrogen.