>>13035366It absolutely does answer the question for starters. OP asked "is a single atom a solid, liquid or gas" and the answer is its not any of those, as those are descriptions of the behaviors of groups of molecules.
Its not a spectrum. The properties which lend themselves to being solid liquid or gas emerge from the collective behavior of a group of particles. Exactly how many particle you need to see that behavior probably varies by molecule and is probably being researched by some computational chemist somewhere.
