11Na22.9897693
Sodium
Alkali Metal
Solid at STP
Period 3Group 1Block SDiscovered 1807
[Ne]3s1
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.
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Atomic Properties
| Atomic Number | 11 |
| Atomic Mass | 22.9897693 u |
| Electron Configuration | [Ne]3s1 |
| Oxidation States | +1 |
| Electronegativity | 0.93 (Pauling) |
| Atomic Radius | 227 pm |
| Ionization Energy | 5.139 eV |
| Electron Affinity | 0.548 eV |
| Block | S |
Physical Properties
| Appearance | silvery white metallic |
| Standard State | Solid |
| Melting Point | 370.95 K (97.8 °C) |
| Boiling Point | 1156 K (882.9 °C) |
| Density | 0.97 g/cm³ |
| Molar Heat | 28.23 J/(mol·K) |
| CPK Color | #AB5CF2 |
Classification
| Category | Alkali Metal |
| Group Block | Alkali metal |
| Period | 3 |
| Group | 1 |
| Block | S |
Discovery
| Year Discovered | 1807 |
| Discovered By | Humphry Davy |
| Electron Shells | 2, 8, 1 |