Dynamic Origin of Atomic Stability and the Unified Mechanical Mechanism of ThreeDimensional Continuous Motion of Extranuclear Electrons

The interior of an atom is an ultrahigh vacuum environment free of medium resistance and energy dissipation. The longterm stable motion of extranuclear electrons relies fundamentally on a continuous, realtime, and synchronous dynamic equilibrium among three interactions: the Coulomb electrostatic attraction from the atomic nucleus, the Lorentz magnetic force generated by the highspeed motion of electrons, and the inertia of electrons themselves. This paper rigorously proves that due to rest mass and inertia, the electron trajectory is neither an ideal perfect circle nor a fixed planar ellipse in celestial mechanics. Planets in the solar system, driven only by universal gravitation and inertia, are confined to motion in a fixed plane and cannot achieve threedimensional spatial deflection. In contrast, electrons are subject to a Lorentz magnetic force perpendicular to the radial Coulomb force, which continuously alters the orbital inclination and direction of motion, enabling 360° omnidirectional spatial orbital motion without a fixed plane or fixed inclination. The macroscopically observed electron cloud is not a random probability distribution, but a longterm trajectory coverage effect of deterministic continuous electron motion. Energy level changes of electrons appear as continuously smooth orbital adjustments, with no instantaneous quantum jumps or teleportation. If, as assumed by traditional quantum mechanics, electrons exhibited discontinuous transitions, probability superposition, or wavefunction collapse, electron motion would be forcibly interrupted, the Lorentz magnetic force would vanish immediately, the threeforce equilibrium would be completely destroyed, and the atom would collapse rapidly, making stable matter impossible. This paper returns to the unified logic of classical mechanics and electromagnetism, restores the continuous, deterministic, and predictable physical nature of microscopic particles, and provides core theoretical support for constructing a unified physical framework connecting macroscopic and microscopic worlds.