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Meitnerium is a synthetic chemical element; it has symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature, but can be created in a laboratory).
Meitnerium (109 Mt) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes.The first isotope to be synthesized was 266 Mt in 1982, and this is also the only isotope directly synthesized; all other isotopes are only known as decay products of heavier elements.
The team bombarded a target of bismuth-209 with accelerated nuclei of iron-58 and detected a single atom of the isotope meitnerium-266: [20] 209 83 Bi + 58 26 Fe → 266 109 Mt + n. This work was confirmed three years later at the Joint Institute for Nuclear Research at Dubna (then in the Soviet Union). [20]
In 1997, a committee of IUPAC adopted the name meitnerium in honor of Lise Meitner (Mt). Elements 101–112 Summary of element naming proposals and final decisions ...
meitnerium, Mt, named after Lise Meitner, an Austrian physicist who was one of the earliest scientists to study nuclear fission (1982). 110. darmstadtium, Ds, named after Darmstadt, Germany, the city in which this work was performed (1994).
Mt ↓ — hassium ← meitnerium → darmstadtium: Atomic number (Z) 109: Group: group 9: Period: period 7: Block
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
Meitnerium: List: 261 Mt 262 Mt 263 Mt 264 Mt 265 Mt 266 Mt 267 Mt 268 Mt 269 Mt 270 Mt 271 Mt 272 Mt 273 Mt 274 Mt 275 Mt 276 Mt 277 Mt 278 Mt 279 Mt 110 ...