DAVID BODANIS: At this time, not a lot was known about the atom. At first people thought it was like a miniature cellular system, there's a solid nucleus of the center and electrons would spin around it, sort of like planets around our sun. A little later, some researchers proposed that the nucleus itself wasn't a solid chunk but was made up of separate particles, of protons and neutrons. But then, in what are called radioactive metals, things like radium and uranium, the nucleus itself seemed to be unstable, leaking out energy and particles. Perhaps this was an example of E = mc2, the mass of a nucleus turning into energy?
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