I believe it would be plasma.
Re-thought my answer....
KE is the temperature measure of a substance
Start with a solid....heat it up ....the KE increases
if the KE increases enough , the soldi melts and becomes a liquid
heat it more and the KE overcomes the INTERmolecular forces holding the substance together and it becomes a gas
where intermolecular forces ae negligible
heat the gas up a lot more and INTRAmolecular forces are overcome and you get a plasma of electrons and ions.....
So I would say the answer you need is GAS ! sorry.....didn't think it tthrough...