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2 dez 1918 ano - Francis William Aston: Isotopes With a mass spectrometer, he discovered the existence of isotopes and created the “whole number rule” which states “the masses of the isotopes are whole number multiples of the mass of the hydrogen atom”

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Atomic Structure timeline

ByHillary Yip
25 nov 2017
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2 dez 1918 ano
Agora
~ 107 years ago
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