What happens to matter at absolute zero?
Well…physicists recently produced a new state of matter called the Bose-Einstein Condensate at a temperature of less than 1 micro Kelvin. The 50 or so atoms in this mass seemed to dissolve into a large amorphous quantum state in which the individual atoms seemed to have lost some of their individuality. The nuclei would not loose their nuclear integrity, but the surrounding electron clouds would probably blend together indistinguishably. Beyond this, I don’t know.