In the 1920s the periodic system turned out to be a macroscopic representation of the internal structure of the atoms – making it as much about physics as it is about chemistry

French nobleman considered the father of modern chemistry

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Chemistry Nobel Laureate and a pioneer of host–guest chemistry

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Pioneer of actinide and fluoride chemistry and Manhattan Project worker

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Considered one of the fathers of modern analytical chemistry

Pioneer of valence theory known for Abegg's rule, a precursor to the octet rule

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