109
Mt
277.154
Meitnerium
Unknown
Group 9
Period 7
Block d
Meitnerium is a chemical element of the periodic table with chemical symbol Mt and atomic number 109 with an atomic weight of 277.154 u and is classed as unknown and is part of group 9 (cobalt group). Meitnerium is solid at room temperature.
Meitnerium in the periodic table
| Symbol | Mt |
| Atomic number | 109 |
| Group | 9 (Cobalt group) |
| Period | 7 |
| Block | d |
| Classification | Unknown |
| Appearance | - |
| Color | - |
| Number of protons | 109 p+ |
| Number of neutrons | 168 n0 |
| Number of electrons | 109 e- |
From Wikipedia, the free encyclopediaMeitnerium is a chemical element with symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds.
Physical properties
| Phase at STP | Solid |
| Density | 37.4 g/cm3 |
| Atomic weight | 277.154 u |
Thermal properties
Atomic properties
| Electronegativity (Pauling Scale) | - |
| Electron affinity | - |
| Oxidation states | (+1), (+3), (+4), (+6), (+8), (+9) (predicted) |
| Ionization energies |
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Electron configuration for meitnerium
Electron configuration Shorthand configuration | [Rn] 5f14 6d7 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d7 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 32, 32, 15, 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valence electrons | 9 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Meitnerium (Mt) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
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The history of Meitnerium
| Discovery | Gesellschaft für Schwerionenforschung (1982) |
| Named by | GSI |
Discovery of meitnerium Meitnerium was first synthesized in 1982 by Peter Armbruster, Gottfried Münzenberg and the GSI team in Darmstadt by bombarding bismuth-209 with iron-58 ions; a single atom was detected. The element was named in honour of the Austrian-Swedish physicist Lise Meitner, who co-discovered nuclear fission with Otto Hahn but was long denied the Nobel Prize. | |
| Original word | Meitner |
| Language of origin | English |
| Name source | Person |
| Meaning | “Lise Meitner” |
Naming The element is named in honour of Lise Meitner, the Austrian-Swedish physicist who co-discovered nuclear fission with Otto Hahn. | |
Identifiers
List of unique identifiers for Meitnerium in various chemical registry databases| CAS Number | 54038-01-6 |
| ChemSpider ID | - |
| EC number | - |
| PubChem CID Number | 56951716 |