On August 1, 1774, which English chemist “discovered” oxygen when he obtained a colourless gas by heating red mercuric oxide?

On August 1, 1774, which English chemist “discovered” oxygen when he obtained a colourless gas by heating red mercuric oxide? Correct Answer Joseph Priestley

On August 1, 1774, Joseph Priestley “discovered” oxygen when he obtained a colourless gas by heating red mercuric oxide. He was the first to publish his results and is credited with this discovery, although “oxygen” had been isolated sometime between 1770 and 1773 by Swedish German chemist Carl Wilhelm Scheele.
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