Earth (historical chemistry)

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Earths were defined by the Ancient Greeks as "materials that could not be changed further by the sources of heat then available".[1] Several oxides were thought to be earths, such as aluminum oxide and magnesium oxide.[1] It wasn't discovered until 1808 that these weren't elements but metallic oxides.[1][2]

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  1. ^ a b c Generalic, Eni. "History of the rare earth elements". www.periodni.com. Retrieved 12 April 2020.
  2. ^ "Alkaline-earth metal". Encyclopædia Britannica. Retrieved 18 April 2019. By the early 1800s it became clear that the earths, formerly considered to be elements, were oxides, compounds of a metal and oxygen.