Lr
Lawrencium
LAWRENCIUM
TRANSITION ELEMENT: ACTINIDE
| Atomic number: | 103 |
| Group numbers: | 3 |
| Period: | 7 |
| Electronic configuration: | [Rn] 5f14 6d1 7s2 |
| Formal oxidation number: | +3 |
| Electronegativities: | - |
| Atomic radius / pm: | - |
| Relative atomic mass: | - |
Lawrencium was discovered by Albert Ghiorso, Torbjorn Sikkeland, Almon E. Larsh, and Robert M. Latimer (US) in 1961. Named in honour of Ernest O. Lawrence, inventor of the cyclotron. It is a synthetic radioactive metal. Lawrencium was produced by bombarding a mixture of three isotopes of californium with boron-10 and boron-11 ions. Eight isotopes of lawrencium have been synthesized to date, with the longest-lived being lawrencium-256, which has a half-life of about 30 seconds.
| Density / g dm-3: | - | |
| Molar volume / cm3mol-1: | - | |
| Electrical resistivity / µΩcm: | - | (20 °C) |
| Thermal conductivity / W m-1K-1: | - |
| Melting point / °C: | - |
| Boiling point / °C: | - |
| Heat of fusion / kJ mol-1: | - |
| Heat of vaporization / kJ mol-1: | - |
| Heat of atomization / kJ mol-1: | 308 |
| First ionization energy / kJ mol-1: | - |
| Second ionization energy / kJ mol-1: | - |
| Third ionization energy / kJ mol-1: | - |
| in the atmosphere / ppm: | - |
| in the Earth's crust / ppm: | - |
| in the oceans / ppm: | - |
| Crystal structure: | unknown structure |
| Unit-cell dimensions / pm: | - |
| Space group: | - |
| Isotope | Relative atomic mass | Mass percent (%) |
|---|---|---|
| 261Lr | 261.107(2) | * |
| 262Lr | 262.110(2) | * |
| Balanced half-reaction | Eo / V | |
|---|---|---|
| 102 Nobelium | ← | 103 Lawrencium | → | 104 Rutherfordium |
Citing this page:
Generalic, Eni. "Lawrencium." EniG. Periodic Table of the Elements. KTF-Split, 18 Jan. 2024. Web. {Date of access}. <https://www.periodni.com/lr.html>.
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