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(1864) John Newlands
Arranged elements along to their atomic weights . noticed every 8th element had similar properties.
Noticed a pattern that was recurring or periodic
(1894) William Ramsay
Used new technology of refrigeration to liquefy and separate components.
Successfully removed water, co2, oxygen and nitrogen but found he had some unknown gases behind, argon. Hebforund more gases called the noble gases on the far righr of the periodic table
(1911) Marie Curie
Developed the theory of radiactivity, won 2 noble prizes for her work on radiation.
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