11 - Sodium alkali metal
Discovered by Humphry Davy in 1807
- Atomic Radius (Å)
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.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 1 | 1 in 3s |
22.99 u
Atomic Mass
2.2 Å
Atomic Radius
1156 K
Boiling Point
1.66 Å
Covalent Radius
0.97 g/cm³
Density
52.87
Electron Affinity
0.93
Electronegativity
5.14 eV
First Ionization Energy
371.15 K
Melting Point
3
Number of Shells
1
Electron Valency
11
Atomic Number
2, 8, 1
Electron Shell Occupations
1.23 J/(g K)
Specific Heat
