Question

Describe modern periodic table history.....​

Answer 1

Ans=In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them. Thomson first discovered electrons; small negatively charged particles in an atom.

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Answer 2

Answer:

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• In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass.
• He predicted the discovery of other elements, and left spaces open in his periodic table for them.
• Thomson first discovered electrons; small negatively charged particles in an atom.

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