97
Bk
247
Berkelium
Actinide
Period 7
Block f
Berkelium is a chemical element of the periodic table with chemical symbol Bk and atomic number 97 with an atomic weight of 247 u and is classed as actinide. Berkelium is solid at room temperature.
Berkelium in the periodic table
| Symbol | Bk |
| Atomic number | 97 |
| Group | - |
| Period | 7 |
| Block | f |
| Classification | Actinide |
| Appearance | Silvery |
| Color | - |
| Number of protons | 97 p+ |
| Number of neutrons | 150 n0 |
| Number of electrons | 97 e- |
From Wikipedia, the free encyclopediaBerkelium is a transuranic radioactive chemical element with symbol Bk and atomic number 97. It is a member of the actinide and transuranium element series. It is named after the city of Berkeley, California, the location of the University of California Radiation Laboratory where it was discovered in December 1949.
Physical properties
| Phase at STP | Solid |
| Density | 14.78 g/cm3 |
| Atomic weight | 247 u |
Thermal properties
| Melting point | 1259 K 985.85 °C 1806.53 °F |
| Boiling point | 2900 K 2626.85 °C 4760.33 °F |
| Heat of vaporization | - |
Atomic properties
| Electronegativity (Pauling Scale) | 1.3 |
| Electron affinity | -165.24 kJ/mol |
| Oxidation states | +2, +3, +4, +5 () |
| Ionization energies |
|
Electron configuration for berkelium
Electron configuration Shorthand configuration | [Rn] 5f9 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f9 6s2 6p6 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Electrons per shell | 2, 8, 18, 32, 27, 8, 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outer shell electrons | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | 3,4 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Berkelium (Bk) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The history of Berkelium
| Discovery | Lawrence Berkeley National Laboratory (1949) |
Discovery of berkelium Berkelium was first synthesized in December 1949 by Stanley Thompson, Albert Ghiorso and Glenn Seaborg at the University of California, Berkeley, by bombarding americium-241 with alpha particles. The name honours the city of Berkeley, where the discovery was made, paralleling the naming of terbium after the Swedish town Ytterby. Only milligram amounts have ever been produced. | |
| Original word | Berkeley |
| Language of origin | English |
| Name source | Place |
| Meaning | “Berkeley” |
| Country | United States |
Naming The element is named after the city of Berkeley, California, home of the laboratory where it was first synthesised in 1949. | |