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Dmitri Mendeleev
1834–1907 · Russia · Born in the 1800s
Published the periodic table in 1869, ordering elements by atomic weight and predicting the properties of elements not yet discovered.
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Periodic table and periodic trends
Why the periodic table has its shape, and how atomic size, ionization energy and electronegativity change across it.
Introduction to the periodic table
Read periods and groups to connect element positions with electron patterns and broad chemical trends.