1774: Oxygen is ‘discovered’ by Britain’s Sir Joseph Priestly, and given a symbol (O), though most refer to it as “the substance formerly known as air.”
By penner (http://flickr.com/photos/penner/2450784866) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0) or GFDL (http://www.gnu.org/copyleft/fdl.html)], via Wikimedia Commons
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