Meitnerium (Mt)

Meitnerium is the 109th element in the periodic table and has a symbol of Mt and atomic number of 109. It has an atomic weight of (276) and a mass number of 265. Meitnerium has one hundred nine protons and one hundred fifty-six neutrons in its nucleus, and one hundred nine electrons in seven shells. It is located in group nine, period seven and block d of the periodic table. 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 Number	109
Atomic Weight	276
Mass Number	265

Group	9
Period	7
Block	d

Protons	109 p⁺
Neutrons	156 n⁰
Electrons	109 e^-

Properties

Physical Properties
Atomic Radius
Molar Volume
Covalent Radius	129 pm 125 pm 113 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density	37.4 g/cm³
Energy
Proton Affinity
Electron Affinity
Ionization Energy	50 eV/particle 94 eV/particle 109 eV/particle 187 eV/particle 202 eV/particle 235.9 eV/particle 257 eV/particle 289 eV/particle 318 eV/particle 346 eV/particle 386 eV/particle 406 eV/particle 445 eV/particle 1,035 eV/particle 1,072 eV/particle 1,112 eV/particle 1,154 eV/particle 1,195 eV/particle 1,234 eV/particle 1,311 eV/particle 1,352 eV/particle 1,397 eV/particle 1,439 eV/particle 4,464 eV/particle 4,551 eV/particle 4,640 eV/particle 4,740 eV/particle 4,830 eV/particle 4,920 eV/particle 5,160 eV/particle 5,250 eV/particle 5,360 eV/particle 5,450 eV/particle 5,840 eV/particle 5,930 eV/particle 6,030 eV/particle 6,130 eV/particle 7,040 eV/particle 7,150 eV/particle 7,440 eV/particle 7,550 eV/particle 11,460 eV/particle 11,660 eV/particle 11,870 eV/particle 12,100 eV/particle 12,320 eV/particle 12,530 eV/particle 13,200 eV/particle 13,400 eV/particle 13,700 eV/particle 13,900 eV/particle 14,500 eV/particle 14,700 eV/particle 14,900 eV/particle 15,100 eV/particle 17,900 eV/particle 18,200 eV/particle 18,700 eV/particle 18,900 eV/particle 36,700 eV/particle 37,200 eV/particle 37,800 eV/particle 38,300 eV/particle 48,500 eV/particle 49,400 eV/particle 50,300 eV/particle 199,606 eV/particle

Heat of Vaporization
Heat of Fusion
Heat of Formation
Electrons
Electron Shells	2, 8, 18, 32, 32, 15, 2

Valence Electrons	2
Electron Configuration	[Rn] 5f¹⁴ 6d⁷ 7s²

Oxidation States
Electronegativity
Electrophilicity
Phases
Phase	Solid
Gas Phase
Boiling Point
Melting Point
Critical Pressure
Critical Temperature
Triple Point
Visual
Meitnerium is a Colorless. Mt has a Jmol of #eb0026.
Color	Colorless #eb0026
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
The lattice angles of Meitnerium is .
Crystal Structure	()
Lattice Constant
Lattice Angles
Mechanical Properties

Hardness
Bulk Modulus
Shear Modulus
Young Modulus
Poisson Ratio
Speed of Sound
Classification
The CAS Group of Meitnerium is VIIIA. The IUPAC Group of Mt is VIII. The Mendeleev Number of Element 109 is 66. The Goldschmidt Class of Meitnerium (Mt) is synthetic.
Category	Transition metals, Transition metals
CAS Group	VIIIA
IUPAC Group	VIII
Glawe Number
Mendeleev Number	66
Pettifor Number
Geochemical Class
Goldschmidt Class	synthetic
Other
The Dipole Polarizability of Meitnerium is 34 plus or minus 3 a₀. The Allotropes of Mt is . The Quantum Numbers of Element 109 is 4F9/2. The Space Group of Meitnerium (Mt) is ().
Gas Basicity
Dipole Polarizability	34 ± 3 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers	4F9/2
Space Group	()

Isotopes of Meitnerium

Stable Isotopes	0
Unstable Isotopes	18
Radioactive Isotopes	18

²⁶⁵Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	265.135937 ± 0.000471 Da
Mass Number	265
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁶⁵Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%

²⁶⁶Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	266.137062253 ± 0.000103568 Da
Mass Number	266
G-Factor
Half Life	2 ± 0.5 ms
Spin
Quadrupole Moment
Discovery Year	1982
Parity

²⁶⁶Mt Decay Modes

Decay Mode	Intensity
α (α emission)	100%
SF (spontaneous fission)	%

²⁶⁷Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	267.137189 ± 0.00054 Da
Mass Number	267
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁶⁷Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%

²⁶⁸Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	268.138649 ± 0.00025 Da
Mass Number	268
G-Factor
Half Life	23 ± 7 ms
Spin
Quadrupole Moment
Discovery Year	1995
Parity

²⁶⁸Mt Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁶⁹Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	269.138809 ± 0.000335 Da
Mass Number	269
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁶⁹Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%

²⁷⁰Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	270.140322 ± 0.000205 Da
Mass Number	270
G-Factor
Half Life	800 ± 400 ms
Spin
Quadrupole Moment
Discovery Year	2004
Parity

²⁷⁰Mt Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷¹Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	271.140741 ± 0.000354 Da
Mass Number	271
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷¹Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%

²⁷²Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	272.143298 ± 0.000521 Da
Mass Number	272
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷²Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁷³Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	273.144695 ± 0.000455 Da
Mass Number	273
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷³Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁷⁴Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	274.147343 ± 0.000404 Da
Mass Number	274
G-Factor
Half Life	850 ± 540 ms
Spin
Quadrupole Moment
Discovery Year	2007
Parity

²⁷⁴Mt Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷⁵Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	275.148972 ± 0.000416 Da
Mass Number	275
G-Factor
Half Life	31 ± 17 ms
Spin
Quadrupole Moment
Discovery Year	2004
Parity

²⁷⁵Mt Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷⁶Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	276.151705 ± 0.000571 Da
Mass Number	276
G-Factor
Half Life	700 ± 80 ms
Spin
Quadrupole Moment
Discovery Year	2004
Parity

²⁷⁶Mt Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷⁷Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	277.153525 ± 0.000711 Da
Mass Number	277
G-Factor
Half Life	9 ± 6 s
Spin
Quadrupole Moment
Discovery Year	2013
Parity

²⁷⁷Mt Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	100%
α (α emission)	%

²⁷⁸Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	278.156487 ± 0.000621 Da
Mass Number	278
G-Factor
Half Life	6 ± 3 s
Spin
Quadrupole Moment
Discovery Year	2010
Parity

²⁷⁸Mt Decay Modes

Decay Mode	Intensity
α (α emission)	100%

²⁷⁹Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	279.158439 ± 0.00072 Da
Mass Number	279
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷⁹Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁸⁰Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	280.161579 ± 0.000644 Da
Mass Number	280
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁸⁰Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁸¹Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	281.163608 ± 0.000644 Da
Mass Number	281
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁸¹Mt Decay Modes

Decay Mode	Intensity
α (α emission)	%
SF (spontaneous fission)	%

²⁸²Mt

Abundance	Radioactive ☢️
Relative Atomic Mass	282.166888 ± 0.00048 Da
Mass Number	282
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year	2016
Parity

²⁸²Mt Decay Modes

Decay Mode	Intensity
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

Discoverers	Heavy Ion Research Laboratory (HIRL)
Discovery Location	Germany
Discovery Year	1982
Etymology (Name Origin)	Named in honor of Lise Mietner
Pronunciation	MITE-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

Meitnerium on ChemicalAid

Australian Educational Vocabulary ID	scot/3542
CAS Registry Number	54038-01-6
Den Store Danske ID	meitnerium
Elhuyar ZTH ID	064406
Encyclopædia Britannica Online ID	science/meitnerium
Freebase ID	/m/025s2kx
French Vikidia ID	Meitnérium
GND ID	4518308-9
Gran Enciclopèdia Catalana ID	0276180
Great Russian Encyclopedia Online ID	2201395
KBpedia ID	Meitnerium
OmegaWiki Defined Meaning	333247
Store norske leksikon ID	meitnerium
USGS Thesaurus ID	1501

Meitnerium (Mt)

Properties

Isotopes of Meitnerium

265Mt

265Mt Decay Modes

266Mt

266Mt Decay Modes

267Mt

267Mt Decay Modes

268Mt

268Mt Decay Modes

269Mt

269Mt Decay Modes

270Mt

270Mt Decay Modes

271Mt

271Mt Decay Modes

272Mt

272Mt Decay Modes

273Mt

273Mt Decay Modes

274Mt

274Mt Decay Modes

275Mt

275Mt Decay Modes

276Mt

276Mt Decay Modes

277Mt

277Mt Decay Modes

278Mt

278Mt Decay Modes

279Mt

279Mt Decay Modes

280Mt

280Mt Decay Modes

281Mt

281Mt Decay Modes

282Mt

282Mt Decay Modes