Atomic Properties
- Atomic Number
- 11
- Atomic Mass
- 22.9900 u
- Electron Configuration
- [Ne] 3s1
- Electronegativity
- 0.93
- Block
- s-block
- Group
- 1
- Period
- 3
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 370.94 K
- Boiling Point
- 1156.09 K
- Density
- 0.9680 g/cm³
About Sodium
Soft, reactive metal; essential nutrient; reacts violently with water.
Why "Na" for Sodium?
Na←Natrium(Latin)
The symbol Na comes from "Natrium," the Latin name derived from the Greek "nítron" (sodium carbonate). The English name "Sodium" comes from "soda," referring to sodium compounds used since ancient times.
Isotopes of Sodium
Sodium has 1 naturally occurring isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 23Na | 23 | 22.98976928 | 100.00% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)