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Oxygen was discovered independently by Carl Wilhelm Scheele , in Uppsala , in 1773 or earlier, and Joseph Priestley in Wiltshire , in 1774, but Priestley is often given priority because his work was published first. The name oxygen was coined in 1777 by Antoine Lavoisier , whose experiments with oxygen helped to discredit the then-popular phlogiston theory of combustion and corrosion . Its name derives from the Greek roots ὀξύς oxys , "acid", literally "sharp", referring to the sour taste of acids and -γενής -genes , "producer", literally "begetter", because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition.

Azula harbored deep mental instabilities, believing her mother loved Zuko more than her. [8] Raised by her father in an environment without a mother-figure, Azula had to be nothing less than perfect in her father's eyes just to earn any affection from him. After the betrayal of her two closest friends Mai and Ty Lee, these instabilities were brought up to the surface. [1] Upon the arrival of Sozin's Comet , Azula was soon to be crowned Fire Lord; [9] however, her defeat at the hands of her brother Zuko and Katara caused her to suffer a complete mental breakdown. [10]

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