Meitnerium

Meitnerium (Mt)

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.
Atomic Number109
Atomic Weight276
Mass Number265
Group9
Period7
Blockd
Protons109 p+
Neutrons156 n0
Electrons109 e-
Electron shell 109 Meitnerium.svg Animated Bohr Model of Mt (Meitnerium) Enhanced Bohr Model of Mt (Meitnerium) Bohr Model: Mt (Meitnerium) Orbital Diagram of Mt (Meitnerium)

Properties

Atomic Radius
Molar Volume
Covalent Radius
129 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density
37.4 g/cm³
Energy
Proton Affinity
Electron Affinity
Ionization Energy
Heat of Vaporization
Heat of Fusion
Heat of Formation
Electrons
Electron Shells2, 8, 18, 32, 32, 15, 2
Valence Electrons0
Electron Configuration[Rn] 5f14 6d7 7s2
Oxidation States
Electronegativity
Electrophilicity
Phases
PhaseSolid
Gas Phase
Boiling Point
Melting Point
Critical Pressure
Critical Temperature
Triple Point
Visual
Color
Colorless
Appearance
Refractive Index
Thermodynamic Properties
Thermal Conductivity
Thermal Expansion
Molar Heat Capacity
Specific Heat Capacity
Heat Capacity Ratio (Adiabatic Index)
Electrical Properties
Type
Electrical Conductivity
Electrical Resistivity
Superconducting Point
Magnetism
Type
Magnetic Susceptibility (Mass)
Magnetic Susceptibility (Molar)
Magnetic Susceptibility (Volume)
Magnetic Ordering
Curie Point
Neel Point
Structure
Crystal Structure ()
Lattice Constant
Lattice Angles
Mechanical Properties
Hardness
Bulk Modulus
Shear Modulus
Young Modulus
Poisson Ratio
Speed of Sound
Classification
CategoryTransition metals, Transition metals
CAS GroupVIIIA
IUPAC GroupVIII
Glawe Number
Mendeleev Number66
Pettifor Number
Geochemical Class
Goldschmidt Classsynthetic
Other
Gas Basicity
Dipole Polarizability
34 ± 3 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers4F9/2
Space Group ()

Isotopes of Meitnerium

Stable Isotopes0
Unstable Isotopes18
Radioactive Isotopes18

265Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
265.135937 ± 0.000471 Da
Mass Number265
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

265Mt Decay Modes
Decay ModeIntensity
α (α emission)%

266Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
266.137062253 ± 0.000103568 Da
Mass Number266
G-Factor
Half Life
2 ± 0.5 ms
Spin
Quadrupole Moment
Discovery Year1982
Parity

266Mt Decay Modes
Decay ModeIntensity
α (α emission)100%
SF (spontaneous fission)%

267Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
267.137189 ± 0.00054 Da
Mass Number267
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

267Mt Decay Modes
Decay ModeIntensity
α (α emission)%

268Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
268.138649 ± 0.00025 Da
Mass Number268
G-Factor
Half Life
23 ± 7 ms
Spin
Quadrupole Moment
Discovery Year1995
Parity

268Mt Decay Modes
Decay ModeIntensity
α (α emission)100%

269Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
269.138809 ± 0.000335 Da
Mass Number269
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

269Mt Decay Modes
Decay ModeIntensity
α (α emission)%

270Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
270.140322 ± 0.000205 Da
Mass Number270
G-Factor
Half Life
800 ± 400 ms
Spin
Quadrupole Moment
Discovery Year2004
Parity

270Mt Decay Modes
Decay ModeIntensity
α (α emission)100%

271Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
271.140741 ± 0.000354 Da
Mass Number271
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

271Mt Decay Modes
Decay ModeIntensity
α (α emission)%

272Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
272.143298 ± 0.000521 Da
Mass Number272
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

272Mt Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

273Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
273.144695 ± 0.000455 Da
Mass Number273
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

273Mt Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

274Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
274.147343 ± 0.000404 Da
Mass Number274
G-Factor
Half Life
850 ± 540 ms
Spin
Quadrupole Moment
Discovery Year2007
Parity

274Mt Decay Modes
Decay ModeIntensity
α (α emission)100%

275Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
275.148972 ± 0.000416 Da
Mass Number275
G-Factor
Half Life
31 ± 17 ms
Spin
Quadrupole Moment
Discovery Year2004
Parity

275Mt Decay Modes
Decay ModeIntensity
α (α emission)100%

276Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
276.151705 ± 0.000571 Da
Mass Number276
G-Factor
Half Life
700 ± 80 ms
Spin
Quadrupole Moment
Discovery Year2004
Parity

276Mt Decay Modes
Decay ModeIntensity
α (α emission)100%

277Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
277.153525 ± 0.000711 Da
Mass Number277
G-Factor
Half Life
9 ± 6 s
Spin
Quadrupole Moment
Discovery Year2013
Parity

277Mt Decay Modes
Decay ModeIntensity
SF (spontaneous fission)100%
α (α emission)%

278Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
278.156487 ± 0.000621 Da
Mass Number278
G-Factor
Half Life
6 ± 3 s
Spin
Quadrupole Moment
Discovery Year2010
Parity

278Mt Decay Modes
Decay ModeIntensity
α (α emission)100%

279Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
279.158439 ± 0.00072 Da
Mass Number279
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

279Mt Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

280Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
280.161579 ± 0.000644 Da
Mass Number280
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

280Mt Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

281Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
281.163608 ± 0.000644 Da
Mass Number281
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

281Mt Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

282Mt

AbundanceRadioactive ☢️
Relative Atomic Mass
282.166888 ± 0.00048 Da
Mass Number282
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year2016
Parity

282Mt Decay Modes
Decay ModeIntensity
α (α emission)100%
SF (spontaneous fission)%

History

Meitnerium was first synthesized in 1982 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt. The team bombarded a target of bismuth-209 with accelerated nuclei of iron-58 and detected a single atom of the isotope meitnerium-266. Named after Lise Meitner, the Austrian physicist

DiscoverersHeavy Ion Research Laboratory (HIRL)
Discovery LocationGermany
Discovery Year1982
Etymology (Name Origin)Named in honor of Lise Mietner
PronunciationMITE-ner-i-um (English)
Meitnerium is harmful due to its radioactivity
Meitnerium has 7 isotopes whose half-lives are known

Uses

Meitnerium is used for scientific research purposes only. It has no significant commercial applications.

Sources

Obtained by bombarding bismuth-209 with iron-58.

Abundance
Abundance in Earth's crust
Abundance in Oceans
Abundance in Human Body
0 %
Abundance in Meteor
0 %
Abundance in Sun
0 %
Abundance in Universe
0 %

Nuclear Screening Constants