Question

in 1869 which classified elements systematically in a table
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Answer 1

Explanation:

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Answer 2

Answer:

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Explanation:

Mendeleev's Periodic Table. In 1869, a Russian chemist called Dmitri Mendeleev published a periodic table. He arranged all 63 elements known at the time in order of relative atomic mass. He put those elements in a group that had similar properties.