Isotopes, sub-atomic particles and relative atomic mass Sub-atomic particles A subatomic particle Is a particle smaller than an atom: It may be elementary or composite. In 1905, Albert Einstein demonstrated the physical reality of the photons, hypothesized by Max Planck

ISOTOPES History of the term: In the bottom right corner of JJ Thomson’s photographic plate are the separate impact marks for the two isotopes of neon: neon-20 and neon-22. The term isotope was coined in 1913 by Margaret Todd, a

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