Which colourless, odourless gas, relatively unreactive at ordinary temperatures, was identified by Daniel Rutherford in 1772?

Explanation

Daniel Rutherford identified nitrogen in 1772 while studying air remaining after oxygen had been removed. At ordinary conditions, nitrogen is a colourless, odourless gas composed mainly of N₂ molecules and is relatively unreactive because of the strong N≡N bond. The element was discovered, not invented.