Oxygen (O)
Oxygen is essential for respiration in most living organisms and is the third most abundant element in the universe.
Properties of Oxygen
- Atomic number
- 8
- Category
- Nonmetal
- Atomic mass
- 15.999 u
- Electron configuration
- [He] 2s² 2p⁴
- Melting point
- 54.36 K (-218.79 °C)
- Boiling point
- 90.19 K (-182.96 °C)
- Density
- 0.001429 g/cm³
- Electronegativity (Pauling)
- 3.44
- Appearance
- Colorless gas
- Discovered by
- Carl Wilhelm Scheele (1771)
Facts about Oxygen
- Oxygen makes up about 21% of the air we breathe!
- Liquid oxygen is pale blue in color!
- Oxygen is the most abundant element in the Earth's crust!
- Without oxygen, fire cannot burn!