11Solid
Na 22.99 Atomic mass · uAlkali metals
Sodium
Sodium /ˈsoʊdiəm/ is a chemical element with symbol Na (from Ancient Greek Νάτριο) and atomic number 11. It is a soft, silver-white, highly reactive metal. In the Periodic table it is in column 1 (alkali metals), and shares with the other six elements in that column that it has a single electron in its outer shell, which it readily donates, creating a positively charged atom - a cation.
Discovery 1807 (Humphry Davy)
K2L8M1
Physical properties
Values for the element in its standard state.
- Density
- 0.968g/cm³
- Melting point
- 371K
- Boiling point
- 1,156K
- Atomic radius
- 154pm
- Bonding type
- Metallic
- Molar heat
- 28.23J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 1 electrons;
[Ne] represents 10 core electrons. The full view shows them explicitly.
11 electrons Orbital order preserved from source
- Electronegativity
- 0.93Pauling scale
- First ionization energy
- 496kJ/mol
- Electron affinity
- 53kJ/mol
- Van der Waals radius
- 227pm
Na SodiumAtomic number 11
496kJ/mol
Atomic numberGaps indicate unavailable data
About sodium
- Appearance
- Silvery white metallic
- Discovery
- 1807 (Humphry Davy)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.