Mt

Meitnerium

Identification

CAS Number: 54038-01-6

Discovery Year: 1982

Discoverer: Heavy Ion Research Laboratory (HIRL)

Discovery Location: Germany

Properties

Atomic Mass: 276 →Density: 37.4 g/cm³ →

Electronic Structure

Electron Config: [Rn] 5f14 6d7 7s2

Block: d

Period: 7 →Group: 9 →

Abundance & Geochemistry

Goldschmidt Class: synthetic

About

Half-life of approximately 5 ms. The creation of this element demonstrated that fusion techniques could indeed be used to make new, heavy nuclei. Made and identified by physicists of the Heavy Ion Research Laboratory, Darmstadt, West Germany in 1982. Named in honor of Lise Meitner, the Austrian physicist.

Isotopes

Mt-276 276 ☢ 0.730 s

Mt-278 278 ☢ 29.0 s