Question

how the invention of periodic table became a gaint help to mankind

Answer 1

Explanation:

onon 17 February 1869, mandeleyev jotted down the symbols for the chemical elements, putting them in order according to their atomic weight. He wrote down the sequence in such a way that they ended of grouped on the page according to known regularities and periodicities of behaviour

Answer 2

Answer:

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On 17 February 1869, Mendeleyev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights. It was perhaps the greatest breakthrough in the history of chemistry. Mendeleyev's ideas totally changed the way chemists viewed their discipline.

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