3LiLithium6.94[He] 2s¹
alkali metal
Lithium
Lithium (from Greek:λίθος lithos, "stone") is a chemical element with the symbol Li and atomic number 3. It is a soft, silver-white metal belonging to the alkali metal group of chemical elements. Under standard conditions it is the lightest metal and the least dense solid element.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
Electrons by shell
Electron configuration
2s1
At a glance
- Atomic number
- 3
- Atomic mass
- 6.94 u
- Phase
- Solid
- Density
- 0.534 g/cm³
- Melting point
- 453.65 K
- Boiling point
- 1,603 K
- First ionization energy
- 520.2 kJ/mol
- Electronegativity
- 0.98
- Electron affinity
- 59.6326 kJ/mol
- Molar heat capacity
- 24.86 J/(mol·K)
- Period
- 2
- Appearance
- silvery-white
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.