| From Wikipedia, the free encyclopediaLawrencium is a synthetic chemical element with chemical symbol Lr (formerly Lw) and atomic number 103. It is named in honor of Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements. A radioactive metal, lawrencium is the eleventh transuranic element and is also the final member of the actinide series. | |||||||||
Lawrencium in the periodic table | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Symbol | Lr | ||||||||
| Atomic number | 103 | ||||||||
| Group | 0 | ||||||||
| Period | 7 | ||||||||
| Block | f | ||||||||
| Element category | Actinide | ||||||||
Physical properties | |||||||||
| Phase at STP | Solid | ||||||||
| Density | g/cm3 | ||||||||
| Atomic weight | 266 u | ||||||||
| Melting point | 1900 K 1626.85 °C 2960.33 °F | ||||||||
| Boiling point | K °C °F | ||||||||
Atomic properties | |||||||||
| Electronegativity (Pauling Scale) | 1.3 | ||||||||
| Electron affinity | -30.04 kJ/mol | ||||||||
| Oxidation states | +3 () | ||||||||
| Ionization energies |
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Electron configuration | |||||||||
| Elektronkonfiguration (shorthand) | [Rn] 5f14 7s2 7p1 | ||||||||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2 7p1 | ||||||||
| Electrons per shell | 2, 8, 18, 32, 32, 8, 3 | ||||||||
History | |||||||||
| Discovered | 1961 | ||||||||
| Discovered by | Lawrence Berkeley National Laboratory | ||||||||