    Sentence 4, Whai cave Priestley. the claim to being  the first discovered of oxygen?    Sentence, 2 Oxygen....was discovered  independently by, Gerl.. Wilhelm’ Scheele, - in  Uppsala. in 1775 or carlier, and Joseph Priestley]  in. Wilshire, in 1774, but Driestley. is offen. given|  priority because his work was published first.