Chemistry:Earth (historical chemistry)
From HandWiki
Earths were defined by the Ancient Greece 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 was not discovered until 1808 that these weren't elements but metallic oxides.[1][2]
See also
- Rare earth metals
- Alkaline earth metals
References
- ↑ 1.0 1.1 1.2 Generalic, Eni. "History of the rare earth elements". https://www.periodni.com/history_of_rare_earth_elements.html.
- ↑ "Alkaline-earth metal". https://www.britannica.com/science/alkaline-earth-metal. ""By the early 1800s it became clear that the earths, formerly considered to be elements, were oxides, compounds of a metal and oxygen.""
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