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  English physicist who was famous or his discovery of the neutron
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  German theoretical physicist and one of the key pioneers of quantum mechanics.
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  an English physicist whos work justified rom physical laws of the previous empirical and chemical concept of the atomic number
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  Danish physicistfoundational contributions to understanding atomic structure and quantum theory
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  a German physicis best known as the co-inventor of the detector element of the Geiger–Marsden experiment which discovered the atomic nucleus
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  Austrian-Swedish physicist who worked on radioactivity and nuclear physics.
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  New Zealand physicist who came to be known as the father of nuclear physics
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  American experimental physicist known for the measurement of the elementary electronic charge
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  a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity.
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  English physicist
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  Russian chemist and inventor. He created a farsighted version of the periodic table of elements
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  English chemist best known for his pioneering work in the development of modern atomic theory
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  English mathematician and astronomer. He was a key igure in the scientific revolution.
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  Ancient Greek pre-Socratic philosopher know best today for his formulation of an atomic theory.