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The idea of the elements comes up for the first time
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The Henning brand was the first to discover a new element. the phosphorous
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63 elements had already been discovered
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scientists like jonh newlands and alexandre-emile formed their versions of the periodic table
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dmitri mendeleey was the first to publish a modern version of the periodic table
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The Manhattan project produced the discovery of many radioactive elements
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Glenn T suggested a change to the table in the form of an addition to the actinide and lanthanide series
