2. Who formulated the periodic table of elements?
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Dimitri Mendeleev
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Answer:
Dimitri Mendeleev
Explanation:
In 1863 English chemist John Newlands divided the then discovered 56 elements into 11 groups, based on characteristics. In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass.
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