8
O
Oxygen
Oxygen
Oxygen (O)
Reactive Nonmetals · Gas · Period 2 · Group 16
Element Properties
- Atomic Number
- 8
- Symbol
- O
- Atomic Mass
- 15.999
- Category
- Reactive Nonmetals
- Standard State
- Gas
- Period
- 2
- Group
- 16
- Electronegativity
- 3.44
- Atomic Radius
- 152
- Ionization Energy
- 13.62
- Electron Affinity
- 1.46
- Oxidation States
- -2
- Melting Point
- 54.36 K (-218.79 °C)
- Boiling Point
- 90.2 K (-182.95 °C)
- Density
- 0.001429
- Electron Configuration
- [He]2s2 2p4
- Year Discovered
- 1774
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Frequently asked questions
What is the atomic number of Oxygen?
The atomic number of Oxygen is 8, which equals the number of protons in its nucleus.
What is the atomic mass of Oxygen?
The atomic mass of Oxygen is approximately 15.999 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Oxygen?
The electron configuration of Oxygen is [He]2s2 2p4.
Where is Oxygen in the periodic table?
Oxygen is located in period 2, group 16.
When was Oxygen discovered?
Oxygen was discovered in 1774.
Related elements
Same group
16
S
Sulfur
32.07
34
Se
Selenium
78.97
52
Te
Tellurium
127.6
84
Po
Polonium
208.982
116
Lv
Livermorium
293.205