Atomic NumberAtomic Number of Oxygen
Atomic Number of Oxygen is 8.
Chemical symbol for Oxygen is O. Number of protons in Oxygen is 8. Atomic weight of Oxygen is 15.999 u or g/mol. Melting point of Oxygen is -218,4 °C and its the boiling point is -182,9 °C.
» Boiling Point » Melting Point » Abundant » State at STP » Discovery YearAbout Oxygen
Oxygen is one of the fundamental and essential elements for all living creatures on our planet. It occurs in atmosphere in the form of gas without color and odor, as well as one of the two chemical elements in the molecules of water. The name of the element comes from the Greek words meaning acid forming. One more important property of oxygen is creating combustion, or making burning possible. This chemical element has plenty of usages, including welding, steel producing, producing other chemical compounds. Oxygen plays an important role in water purification, as well as is used in medicine, rocket engines production, and so on.
Properties of Oxygen Element
| Atomic Number (Z) | 8 |
|---|---|
| Atomic Symbol | O |
| Group | 16 |
| Period | 2 |
| Atomic Weight | 15.999 u |
| Density | 0.001429 g/cm3 |
| Melting Point (K) | 54.36 K |
| Melting Point (℃) | -218,4 °C |
| Boiling Point (K) | 90.2 K |
| Boiling Point (℃) | -182,9 °C |
| Heat Capacity | 0.918 J/g · K |
| Abundance | 461000 mg/kg |
| State at STP | Gas |
| Occurrence | Primordial |
| Description | Non-metal |
| Electronegativity (Pauling) χ | 3.44 |
| Ionization Energy (eV) | 13.61806 |
| Atomic Radius | 60pm |
| Covalent Radius | 73pm |
| Van der Waals Radius | 152 |
| Valence Electrons | 6 |
| Year of Discovery | 1774 |
| Discoverer | Priestley and Scheele |