XXth century_physics

J. J. Thomson, On the Structure of the Atom:
an Investigation of the Stability and Periods of Oscillation of
a Number of Corpuscules arranged at equal Intervals around
the Circumference of a Circle,
Phil. Mag. 7, 237-265 (1904)
Because of destructive interference the
intensity of radiation by electric charges
moving as a ring is reduced
by many orders of magnitude;
hence, atoms can be quasi-stable