{{asɛmtiNe Ɔkyerɛwfo}} | Nhomakorabea | Nneɛma a ɛma wotumi yɛ ade

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------- created the first periodic table of elements in 1869

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He began to notice patterns when he arranged the elements by increasing

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When the patterns didn’t quite fit, Mendeleev left where there were missing elements.

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He used his knowledge of the patterns to predict the existence of elements as most impressively, predicting their .

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In 1913, a British chemist named Henry Mosely rearranged Mendeleev’s periodic table by increasing , which fixed several of the issues with the earlier table.

12/8 - Notes: Part 4: History of the Periodic Table

12/8 - Notes: Part 4: History of the Periodic Table