1. Daniel Rutherford (1772):
* Rutherford, a Scottish physician and chemist, is credited with the first isolation of nitrogen.
* In his experiments, he removed oxygen from air by burning a candle and then a mouse in a closed container.
* The remaining gas, which wouldn't support combustion or life, he called "phlogisticated air" (meaning "deprived of phlogiston," a hypothetical substance thought to be the basis of fire).
2. Carl Wilhelm Scheele (1772):
* Independently, Scheele, a Swedish chemist and pharmacist, also isolated nitrogen around the same time as Rutherford.
* He called it "vitiated air," meaning "spoiled air."
3. Henry Cavendish (1784):
* Cavendish, an English scientist, confirmed that Rutherford's "phlogisticated air" was a distinct gas.
* He showed that it made up about 78% of the atmosphere.
4. Antoine Lavoisier (1787):
* Lavoisier, a French chemist, recognized that Rutherford's "phlogisticated air" was not simply "deprived of phlogiston" but rather a separate element.
* He gave it the name "azote," from the Greek word "a-zote," meaning "without life."
5. Jean-Antoine Chaptal (1790):
* Chaptal, a French chemist, proposed the name "nitrogen," from the Greek word "nitron" (referring to niter, a mineral used to make nitric acid) and the Greek word "genes," meaning "born of."
Therefore, nitrogen was not discovered by a single person but through a series of experiments and observations by different scientists over a period of about 15 years.
