3Li6.94
Lithium (Li)
Element 3 Ā· Alkali metal
Lithium (Li) is a chemical element with atomic number 3. It is classified as an alkali metal in period 2, group 1 of the periodic table (the s-block). Its standard atomic weight is 6.94 u and its ground-state electron configuration is [He] 2sĀ¹.
Lithium facts
| Atomic number (Z) | 3 |
|---|---|
| Symbol | Li |
| Standard atomic weight | 6.94 u |
| Category | Alkali metal |
| Group | 1 |
| Period | 2 |
| Block | s-block |
| Electron configuration | [He] 2sĀ¹ |
| Electronegativity (Pauling) | 0.98 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 3 / 3 |
| Neutrons (most common isotope, approx.) | 4 |
| Molar mass | 6.94 g/mol |