8 O 15.999
Oxygen
diatomic nonmetal
Properties
- Atomic number
- 8
- Atomic mass
- 15.999 u
- Category
- diatomic nonmetal
- Group
- 16
- Period
- 2
- Block
- p-block
- State (room temp)
- Gas
- Outer-shell electrons
- 6
- Electronegativity
- 3.44 (Pauling)
- Density
- -
- Melting point
- -218.79 °C
- Boiling point
- -182.96 °C
Electron configuration
1s² 2s² 2p⁴
Noble-gas shorthand: [He] 2s² 2p⁴
Electrons per shell: 2, 6, which is 6 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Oxygen
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms compounds (notably oxides) with most elements. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium.
- Discovered by Carl Wilhelm Scheele
- Named by Antoine Lavoisier
Oxygen: frequently asked questions
- What is Oxygen?
- Oxygen (O) is the chemical element with atomic number 8. It is a nonmetal (diatomic nonmetal).
- What is the atomic number of Oxygen?
- Oxygen's atomic number is 8, which means every Oxygen atom has 8 protons in its nucleus.
- What is the electron configuration of Oxygen?
- The electron configuration of Oxygen is 1s2 2s2 2p4 (noble-gas shorthand: [He] 2s2 2p4). Its electrons are arranged in shells of 2, 6, with 6 in the outermost shell.
- Is Oxygen a metal or a nonmetal?
- Oxygen is a nonmetal (diatomic nonmetal).
- What group and period is Oxygen in?
- Oxygen is in group 16 and period 2 of the periodic table.
- Is Oxygen a solid, liquid, or gas?
- At room temperature, Oxygen is a gas.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.