103
Lr
262
Lawrencium
Actinide
Period 7
Block f
Lawrencium is a chemical element of the periodic table with chemical symbol Lr and atomic number 103 with an atomic weight of 262 u and is classed as actinide. Lawrencium is solid at room temperature.
Lawrencium in the periodic table
| Symbol | Lr |
| Atomic number | 103 |
| Group | - |
| Period | 7 |
| Block | f |
| Classification | Actinide |
| Appearance | - |
| Color | - |
| Number of protons | 103 p+ |
| Number of neutrons | 159 n0 |
| Number of electrons | 103 e- |
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.
Physical properties
| Phase at STP | Solid |
| Density | 0 g/cm3 |
| Atomic weight | 262 u |
Thermal properties
| Melting point | 1900 K 1626.85 °C 2960.33 °F |
| Boiling point | - |
| Heat of vaporization | - |
Atomic properties
| Electronegativity (Pauling Scale) | 1.3 |
| Electron affinity | -30.04 kJ/mol |
| Oxidation states | +3 () |
| Ionization energies |
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Electron configuration for lawrencium
Electron configuration Shorthand configuration | [Rn] 5f14 7s2 7p1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2 7p1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 32, 32, 8, 3 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outer shell electrons | 3 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | 3 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Lawrencium (Lr) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
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The history of Lawrencium
| Discovery | Lawrence Berkeley National Laboratory, Joint Institute for Nuclear Research (1961) |
Discovery of lawrencium Lawrencium was first synthesized in 1961 by Albert Ghiorso, Torbjørn Sikkeland, Almon Larsh and Robert Latimer at Berkeley by bombarding californium with boron ions. Soviet researchers at JINR reported independent synthesis in 1965. The element was named in honour of Ernest O. Lawrence, inventor of the cyclotron and founder of the Berkeley radiation laboratory. | |
| Original word | Lawrence |
| Language of origin | English |
| Name source | Person |
| Meaning | “Ernest Lawrence” |
| Symbol origin | Symbol Lw was used formerly, Lr is used since 1963. |
Naming The element is named in honour of Ernest O. Lawrence, inventor of the cyclotron and founder of the Berkeley radiation laboratory. | |