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Henry Moseley.

Dmitri Mendeleev first proposed the Periodic Table be sorted based on atomic weight. After the discovery of protons, Henry Moseley reordered the table based on atomic number. That is the structure we use today.

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11y ago
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13y ago

wow the last person who wrote this is stupid anyways its.....

Dmitri Mendeleev

thanks :P glad i could help!

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12y ago

Dimitri Mendeleev, a Russian chemist in 1869.

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12y ago

Dmitri Medeleev ,

Your welcome ..

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Q: Who created the modern-day periodic table?
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