- 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.
11 Atomic Number
22.99 u Atomic Mass
371.15 K Melting Point
1156 K Boiling Point
0.97 g/cm³ Density
2.2 Å Atomic Radius
1.66 Å Covalent Radius
0.93 Electronegativity
5.14 eV First Ionization Energy
52.87 Electron Affinity
3 Number of Shells
1 Electron Valency
2, 8, 1 Electron Shell Occupations
1.23 J/g Specific Heat