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Meitnerium


109

Mt

Meitnerium
268.00000
2
8
18
32
8
2
2
21

Source

Meitnerium 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.