Perhaps motion is not what is happening in the electron clouds, at least not the motion we sense from the coordinates at which we observe the universe. Remember that you and I are particulate beings, made of what we observe to be atoms and particles...as you say? Also remember that each particle in our body, right down to quarks is located near the Planck Length in scale...10 to the minus 33rd Cm. Physicists say that the "particles" we consist of exist on 4 dimensional particulate "surfaces" very near the cosmic Black Hole. This is the everywhere "dark energy" which makes up 73% of the mass of the universe. In what we call "proper" time, all the "information particles" of which we are made "pulse" into and out of the cosmic dark energy very rapidly...in the blink of an eye. However there is a possibility (inferred by the mathematical dualism of General Relativity, Quantum Mechanics and the Schwarzschild "mirror" geometry) that every particle of our bodies is "inversely mapped" to its antiparticle in space, (but not time) coordinates. As energy is compressed and enters the cosmic black hole in "proper time", it briefly particulates (makes particles) before it disappears. When this particulation process is cross-read from the inversely mapped side of our bodies remotely, a special gravitational time dilation formula in General Relativity describes the creation of the universe as we observe it, being immersed in entangled "photons" or better, the "photonic matrix". Because photons are entangled from one side of the universe to the other, one side of our body can observe the other inversely mapped side remotely, in "time dilation" and presto! Instead of a rapid flashing pulse, we can observe the particulation process in ultra-slow motion and view the vastness of both space and time. Since the life of say the proton is limited to the finite vastness of the space and time as we observe it, the proton, the nucleus, and the electron shells are long lived, but not permanent- from our frame. However, Einstein conceived a static (or more exactly, quasi-static) universe. Einstein thought he was wrong and assumed from the work of Edmund Hubble that the universe must be dynamic. However recent astronomical observations indicate that Einstein’s "cosmological constant" (necessary to keep the universe static) really exists! Scientists are trying to explain the "cosmological constant" as some kind of "vacuum energy", or "quintessence", however it is just as likely that the cosmological constant we observe is actually a geometric phenomenon, a fictitious force (like those on a merry go round) created by the way we observe the structure of a dual universe... in a modified Schwarzchild’s "mirror" geometry. (with a Planck Realm at the center)) If the universe is quasi-static, scientists may have found your perpetual motion, an eternal, phylogenically developing universe.