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A chemist called Dmitri Mendeleev created the best way of arranging all the chemical elements- the modern Periodic Table. He arranged the elements based on their groups, e.g group 1 = alkali metals etc. Protons and nuclei hadn't been observed in his day, so any estimations and predicted elements needed to be clarified in the future. Mendeleev's predictions were accurate- hence his legendary table still exists today. I just hope I've spelt his name correctly!

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14y ago
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Q: The planning and arranging of the elements and principles?
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