Meitnerium

Symbol: Mt
Atomic number: 109
Category: transition metals
Group: 9
Period: 7
Block: d
Atomic weight: [276] g/mol
Electrons per shell: 2, 8, 18, 32, 32, 15, 2
CAS number: 54038-01-6
Phase: presumably a solid
Density: around 30 kg/l (presumed)
Melting point: around 2600-2900 C (presumed)
Boiling point: unknown
Crystal structure: unknown
Oxidation states: 3, 4, 6 (expected)
Electronegativity: unknown
Name's origin: Lise Meitner
Name's meaning: in honor of an Austrian physicist
Facts:
- is a synthetic element
- its most stable isotope, Mt-278, has a predicted half-life of a half-hour
- was first synthesized on August 29, 1982 by a German research team at the Institute for Heavy Ion Research