charleneubah3902 charleneubah3902

29-01-2019
Chemistry

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Who discovered a pattern to the elements in 1869?

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cristisp93 cristisp93

21-07-2019

The Russian chemist Dimitri Mendeleev.

At that time the periodic table listed the elements in order of arranging by atomic mass. (the number of protons in the nucleus of an atom).

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