proton-and-neutron

Updated: May 25, 2025

Tranter was pointing at the diagram on the right. "They got as far as the Bohr atom, anyhow," he said. "Well, not quite. They knew about electron shells, but they have the nucleus pictured as a solid mass. No indication of proton-and-neutron structure. I'll bet, when you come to translate their scientific books, you'll find that they taught that the atom was the ultimate and indivisible particle.

H. Beam Piper - Omnilingual