Nitrogen(N2)

Nitrogen(N2)

History xAbout four-fifths of Earth’s atmosphere is nitrogen, which was isolated and recognized as a specific substance during early investigations of the air. Carl Wilhelm Scheele, a Swedish chemist, showed in 1772 that air is a mixture of two gases, one of which he...
Oxygen(O2)

Oxygen(O2)

Diatomic oxygen gas makes up 20.8% of the Earth’s atmosphere. The constituents of oxides make up about half of the Earth’s crust. The Origin of Oxygen in Earth’s Atmosphere It’s hard to keep oxygen molecules around, despite the fact that...