11 Na 22.99
Sodium
alkali metal
Properties
- Atomic number
- 11
- Atomic mass
- 22.99 u
- Category
- alkali metal
- Group
- 1
- Period
- 3
- Block
- s-block
- State (room temp)
- Solid
- Outer-shell electrons
- 1
- Electronegativity
- 0.93 (Pauling)
- Density
- 0.968 g/cm³
- Melting point
- 97.79 °C
- Boiling point
- 882.94 °C
Electron configuration
1s² 2s² 2p⁶ 3s¹
Noble-gas shorthand: [Ne] 3s¹
Electrons per shell: 2, 8, 1 — that's 1 in the outermost shell.
About 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.
- Discovered by Humphry Davy
- Appearance: silvery white metallic
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.