Word: proton
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Hydrogen atoms, tiny little things composed of one positive particle of electricity (the proton) and one madly whirling negative particle (the electron), which goes round and round its fellow just as the earth circles the sun, have been occupying the attention of physicists and chemists at Princeton University...
...likened the atom to the solar system, with the positive nucleus or proton representing the sun, and the electrons revolving in two concentric rings, at maximum distance from each other. This " open " structure is the most significant feature of the scheme...