| 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 | ||
Atomära egenskaper | |||
| Electronegativity (Pauling Scale) | 1.3 | ||
| Electron affinity | -30.04 kJ/mol | ||
| Ionization energies |
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Electron configuration | |||
| 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 | ||