The planetary model of the atom was fundamentally flawed. It failed theoretically because

A. a perfectly circular orbit would violate the laws of gravitation.
B. electrostatic attraction would not be sufficient to keep the electron/nucleus in a bound state.
C. it predicted positive and negative charge equally distributed throughout the atom.
D. it was well established experimentally that accelerating electrons emit electromagnetic radiation.
E. it did not provide for the existence of neutrons.

An electron orbiting a nucleus in a circular orbit would be under constant acceleration—the direction of velocity changes—and would constantly emit radiation. The electron would continuously lose energy and quickly fall into the nucleus.
D.

Physics & Space Science

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