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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).
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]
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.
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 ...
A synthetic element is one of 24 known chemical elements that do not occur naturally on Earth: they have been created by human manipulation of fundamental particles in a nuclear reactor, a particle accelerator, or the explosion of an atomic bomb; thus, they are called "synthetic", "artificial", or "man-made".
However, the Popa langur, named after nearby Mount Popa, is tragically already on the verge of extinction. Researchers estimate only 200 to 260 individuals remain.
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).
President Donald Trump was named chairman of the board of the Kennedy Center on Feb. 12, 2024. Credit - Photo-Illustration by TIME (Source Images: Angela Weiss—Getty Images, Andrew Caballero ...