the particles are closely packed

First thing to realize is that there are no such things as particles. If there were then there would be ‘nothing’ inside of these particles. For instance, since we both know a perfect square does not exist ( not only because that would defy logic as even your body pulls everything towards it changing the shape of things indefinately, but because there is no such thing as perfection) if we were to group 4 quarks together as tight as we could, what would be in the center of these quarks? A vaccuum? What’s in a vaccuum? Nothing?

Nothing cannot exist, so there is no ‘state’ of matter. Solid, liquid, gas, plasma – all the same. Just different densities.