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Curated category

Diatomic nonmetals

  • NitrogenScottish physician Daniel Rutherford isolated a new gas in 1772 during experiments at the University of Edinburgh. He called this substance noxious air…
  • OxygenOxygen is the third most abundant chemical element in the universe, trailing only hydrogen and helium. About 0.9% of the Sun's mass consists of oxygen.
  • HydrogenAbout 75% of all normal matter in the universe consists of hydrogen. This element formed roughly 370,000 years after the Big Bang when the expanding cosmos…