8O15.999
Oxygen
Reactive non-metal · element 8 · group 16, period 2
Quick facts
| Symbol | O |
|---|---|
| Atomic number | 8 |
| Relative atomic mass | 15.999 |
| Category | Reactive non-metal |
| Position | group 16, period 2 |
| State at 20 °C | Gas |
| Melting point | -218.8 °C |
| Boiling point | -183 °C |
| Density | 0.001 g/cm³ |
| Electronegativity | 3.44 |
| Electron configuration | [He] 2s2 2p4 |
About Oxygen
Oxygen has the symbol O and atomic number 8, which means every oxygen atom has 8 protons in its nucleus and, in a neutral atom, 8 electrons. At room temperature it is a gas.
Non-metals are usually poor conductors of heat and electricity. They form covalent bonds with other non-metals and negative ions with metals.
It melts at -218.8 °C and boils at -183 °C.
Explore it
See where oxygen sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.