Absolute zero. Zero kelvin (â273.15 Â°C) is defined as absolute zero. Absolute zero is the lower limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reaches its minimum value, taken as 0. Absolute zero is the point at which the fundamental particles of nature have minimal vibrational motion, retaining only quantum mechanical, zero-point energy-induced particle motion. The theoretical temperature is determined by extrapolating the ideal gas law; by international agreement, absolute zero is taken as ...
The nuclear spins for individual protons and neutrons parallels the treatment of electron spin, with spin 1/2 and an associated magnetic moment. The magnetic moment is much smaller than that of the electron. For the combination neutrons and protons into nuclei, the situation is more complicated.
Electâ¦rons orbit  the nucleus in shells; within each shell, only the one or two  electrons in the 's' subshell actually orbit the nucleus in  approximately a circular fashion. The rest of the electrons in that  shell orbit in a more complex motion, dictated by the laws of  quantum mechanics.    As a chemist who earned my Ph.D. in physical chemistry, I couldn't  help but correct the original answer.   Firstly, the answer to your question is that electrons do  not move in circular orbits around an atom's  nucleus.