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Henry Cavendish was the first recognize hydrogen as an element.
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Daniel Rutherford discovered nitrogen.
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Oxygen was discovered by Wilhelm Scheele in 1772 but his discovery wasn’t published until 1777 and meanwhile Joseph Priestley discovered and published in 1774.
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French astronomer Pierre Jules Cesar Janssen was the first to observe this element while studying a solar eclipse.
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William Ramsay and Morris M. Travers discovered this while studying liquefied air