# Is the absolute temperature concept 100% viable?

Maybe I'm wrong about it but I wanted to know whether the concept of absolute temperature is real or not.

As every element behaves differently at a particular temperatures how could we assign a common temperature to all these elements where they possess zero point energy? If they will do so then what will happen if we find an new element which ground state energy is at $\mathrm{-10\ K}$ theoretically?