Can absolute zero temperature be reached?
You would have a hard time reaching absolute zero.
If you do, then all pure atoms would collapse to the most ordered zero entropy state (zero motion), and all molecules would only be vibrating (stretching and bending) without flying around and rotating.
Note: at zero ground state temperature, the quantum fluctuations are large in comparison to the energy available, and make it hard for a state to be localised. This is one possible explanation to why one cannot easily maintain absolute zero.