Nuclides
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Chemical element · Atomic number 103
Lawrencium (Lr)
Actinides · Period 7 · Unknown / not established
Element identity
- Atomic number (Z)
- 103
- Symbol
- Lr
- Atomic weight / isotope mass number
- [262]
- Category
- Actinides
- Physical state (reference)
- Unknown / not established
- Period
- 7
- Group (reference)
- 3
- Block
- d
Physical properties
- Appearance
- Silvery
- Density
- Not available
- Melting point
- 1900 K / 1627 °C / 2961 °F
- Boiling point
- Not available
- Sublimation point
- Not available
Atomic and material properties
- Electron configuration
- [Rn] 5f¹⁴ 7s² 7p¹
- Electrons per shell
- K2 L8 M18 N32 O32 P8 Q3
- Oxidation states
- 3
- Electronegativity (Pauling)
- Not available
- Atomic radius
- Not available
- Covalent radius
- Not available
- Molar ionization energies
- 1st: 470 kJ·mol⁻¹ 2nd: 1428 kJ·mol⁻¹ 3rd: 2228 kJ·mol⁻¹ 4th: 4910 kJ·mol⁻¹
- Thermal conductivity
- Not available
- Molar heat capacity
- Not available
- Crystal structure
- Hexagonal close-packed
- CAS number
- 22537-19-5
Property source: Wikipedia — Lawrencium, adapted from the Nuclides App snapshot. Quoted conditions and qualifiers are retained.
Sources and interpretation
Snapshot exported 24 October 2026 from the element assets used by Nuclides. Properties are a reference compilation, not a new evaluation. Missing values are shown as “Not available”. Density and phase depend on temperature, pressure and allotrope; retained conditions are part of the quoted property.
Atomic weight is dimensionless. Parentheses give uncertainty in the last quoted digits. A single integer in square brackets is an isotope mass number, not a standard atomic weight. The snapshot can differ from current evaluations; consult CIAAW standard atomic weights and the IUPAC periodic table for current values and conventions.
Element properties in the App snapshot are adapted from Wikipedia. Each element page links to its source article; text adaptations are available under CC BY-SA 4.0. No third-party images are included.
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