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Hydrogen is a chemical element with symbol H and atomic number 1. Hydrogen is the lightest element on the periodic table. It is the most abundant chemical substance in the Universe, constituting roughly 75% of all mass. In 1766–81, Henry Cavendish was the first to recognize that hydrogen gas was a discrete substance, and that it produces water when burned. In Greek, hydrogen means "water-former".
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The use of this metal and chemical element can be traced back to 3,500 BC. Which chemical element is number 28 in the Periodic Table?
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