107
Bh
270.133
Bohrium
Transition Metal
Group 7
Period 7
Block d
Bohrium is a chemical element of the periodic table with chemical symbol Bh and atomic number 107 with an atomic weight of 270.133 u and is classed as transition metal and is part of group 7 (manganese group). Bohrium is solid at room temperature.
Bohrium in the periodic table
| Symbol | Bh |
| Atomic number | 107 |
| Group | 7 (Manganese group) |
| Period | 7 |
| Block | d |
| Classification | Transition Metal |
| Appearance | - |
| Color | - |
| Number of protons | 107 p+ |
| Number of neutrons | 163 n0 |
| Number of electrons | 107 e- |
From Wikipedia, the free encyclopediaBohrium is a chemical element with symbol Bh and atomic number 107. It is named after Danish physicist Niels Bohr. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 270Bh, has a half-life of approximately 61 seconds.
Physical properties
| Phase at STP | Solid |
| Density | 37.1 g/cm3 |
| Atomic weight | 270.133 u |
Thermal properties
Atomic properties
| Electronegativity (Pauling Scale) | - |
| Electron affinity | - |
| Oxidation states | (+3), (+4), (+5), +7 (parenthesized: prediction) |
| Ionization energies |
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Electron configuration for bohrium
Electron configuration Shorthand configuration | [Rn] 5f14 6d5 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d5 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 32, 32, 13, 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Outer shell electrons | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valence electrons (incl. d) | 7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | 7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Bohrium (Bh) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
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The history of Bohrium
| Discovery | Gesellschaft für Schwerionenforschung (1981) |
| Named by | GSI |
Discovery of bohrium Bohrium was first conclusively synthesized in 1981 by Peter Armbruster, Gottfried Münzenberg and colleagues at GSI in Darmstadt, Germany, using cold fusion of chromium-54 ions with bismuth-209. The element was named in honour of Niels Bohr, the Danish physicist whose model of the atom and work on quantum mechanics shaped 20th-century physics. | |
| Original word | Bohr |
| Language of origin | English |
| Name source | Person |
| Meaning | “Niels Bohr” |
Naming The element is named in honour of Niels Bohr, the Danish physicist whose model of the atom shaped 20th-century physics. | |
Identifiers
List of unique identifiers for Bohrium in various chemical registry databases| CAS Number | 54037-14-8 |
| ChemSpider ID | - |
| EC number | - |
| PubChem CID Number | 56951713 |