phyics question

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...

Jenny, I don't understand a word of this.....but, depending upon what you might trust, here's what this website says  :

https://www.westfield.ma.edu/PersonalPages/cmasi/gen_chem2/imf/phase_changes/ke_vs_imf.htm