Lithium (Li)
Lithium (Li) is element 3 of the periodic table, an alkali metal in period 2 and group 1. Its standard atomic weight is 6.94, so one mole of lithium atoms has a mass of 6.94 g. At room temperature it is a solid; it melts at 180.5 °C and boils at 1341.85 °C.
| Atomic number | 3 |
|---|---|
| Symbol | Li |
| Standard atomic weight | 6.94 |
| Molar mass | 6.94 g/mol |
| Category | Alkali metal |
| Group | 1 |
| Period | 2 |
| Block | s-block |
| Electron configuration | [He] 2s1 |
| Oxidation states | +1 |
| Electronegativity (Pauling) | 0.98 |
| Atomic radius (van der Waals) | 182 pm |
| First ionisation energy | 5.392 eV (520.2 kJ/mol) |
| Electron affinity | 0.618 eV |
| State at room temperature | Solid |
| Melting point | 453.65 K (180.5 °C) |
| Boiling point | 1615 K (1341.85 °C) |
| Density | 0.534 g/cm³ |
| Discovered | 1817 |
Group 1
Calculate with Lithium
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.