Meitnerium is an extremely radioactive synthetic element. The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds and is calculated to have similar properties to its lighter homologues, cobalt, rhodium, and iridium.

1982 by Workers at Gesellschaft für Schwerionenforschung, Germany.

DISCOVERY

From the name of Lise Meitner (Physicist).

ETYMOLOGY

Meitnerium

Element

Mt

Symbol

109

109 Atomic Number

Atomic Number

Transition Metal

Classification

54038-01-6

CAS Number

-

Elemental Colour

-

Refractive Index

-

Poisson Ratio

7.384 cm³

Molar Volume

-

Brinell Hardness

-

Mohs Hardness

-

Vickers Hardness

-

Speed of Sound

-

Bulk Modulus

-

Shear Modulus

-

Young Modulus

Allotropes

NONE

-

Melting Point

-

Boiling Point

-

Automatic Ignition

-

Flashpoint

-

Critical Temperature

-

Critical Pressure

-

Thermal Conductivity

-

Thermal Expansion

-

Specific Heat

-

Heat Fusion

-

Heat Vaporisation

-

Heat Combustion

-

Curie Point

-

Neel Point

-

Adiabatic Index

Solid

Phase

-

Electrical Type

-

Conductivity

-

Resistivity

-

Superconducting Point

-

Magnetic Type

-

Mass Susceptibility

-

Molar Susceptibility

-

Volume Susceptibility

Material Composition

-

Universe

-

Meteorites

-

Sun

-

Earth Crust

-

Oceans

-

Humans

276.151'590'0

Atomic Weight

-

Atomic Radius

129 pm

Covalent Radius Single Bond

125 pm

Covalent Radius Double Bond

113 pm

Covalent Radius Triple Bond

128 pm

Van der Waals Radius

[Rn]7s²5f¹⁴6d⁷

Electron Configuration

Cubic, Face-centred

Crystal Structure

37.400'00 g/cm³

Density as Solid

-

Density as Liquid

-

Density as Gas

-

Space Group Name

-

Space Group Number

-

Lattice Angles

-

Lattice Constants

30.00 minutes

Half Life

43.33 minutes

Lifetime

6d⁷ = 6, 2, -1, -1/2

Quantum Numbers

-

Neutron Cross Section

-

Neutron Mass Absorption

Stable Isotopes

NONE

Unstable Isotopes

Isotopes Overview

Isotope	Stability	Symbol	Type	Protons		Neutrons		Spin	Mass		Abundance		Mass Measure	Mass Excess		Binding Energy		Dipole Moment	Quadrupole Moment	Halflife in Years		Halflife in Seconds		A01 Decay Probability		A01 Decay Mode	A01 Decay Energy		A01 Decay Daughter	A01 Decay Link	A02 Decay Mode	A02 Decay Energy		A02 Decay Daughter	A02 Decay Link	Y01 Decay Product Yield		Y01 Decay Product Nuclide	Y02 Decay Product Yield		Y02 Decay Product Nuclide	Y03 Decay Product Yield		Y03 Decay Product Nuclide	Y04 Decay Product Yield		Y04 Decay Product Nuclide	Y05 Decay Product Yield		Y05 Decay Product Nuclide	Y06 Decay Product Yield		Y06 Decay Product Nuclide	Y07 Decay Product Yield		Y07 Decay Product Nuclide	Y08 Decay Product Yield		Y08 Decay Product Nuclide	Y09 Decay Product Yield		Y09 Decay Product Nuclide	Y10 Decay Product Yield		Y10 Decay Product Nuclide	Y11 Decay Product Yield		Y11 Decay Product Nuclide	Y12 Decay Product Yield		Y12 Decay Product Nuclide
Isotope_109_mt_265_u	Unstable	²⁶⁵Mt	Boson	109	p	156	n	?	265.136'151'000'0	u	~ 0	%	~ 0	139.576'000'000'0	MeV	7.262'000'000'0	MeV	-	-	6.34E-11	year	2.000	milli-seconds ( x⁻³ )	?	%	α	11,070.000	keV	²⁶¹Bh	²⁶⁵Mt > [ ? % , α , 11,070.0 keV ] > ²⁶¹Bh						?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_109_mt_266_u	Unstable	²⁶⁶Mt	Fermion	109	p	157	n	?	266.137'299'000'0	u	~ 0	%	~ 0	126.824'000'000'0	MeV	7.271'000'000'0	MeV	-	-	3.80E-11	year	1.200	milli-seconds ( x⁻³ )	?	%	α	10,995.600	keV	²⁶²Bh	²⁶⁶Mt > [ ? % , α , 10,995.6 keV ] > ²⁶²Bh	SF	?	keV	V	²⁶⁶Mt > [ , SF , ? keV ] > V	17.691'756	%	²⁰⁶Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_109_mt_267_u	Unstable	²⁶⁷Mt	Boson	109	p	158	n	?	267.137'307'000'0	u	~ 0	%	~ 0	127.893'000'000'0	MeV	7.270'000'000'0	MeV	-	-	3.17E-10	year	10.000	milli-seconds ( x⁻³ )	?	%	α	10,870.000	keV	²⁶³Bh	²⁶⁷Mt > [ ? % , α , 10,870.0 keV ] > ²⁶³Bh						?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁷⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_109_mt_268_u	Unstable	²⁶⁸Mt	Fermion	109	p	159	n	?	268.138'728'000'0	u	~ 0	%	~ 0	127.901'000'000'0	MeV	7.273'000'000'0	MeV	-	-	1.68E-9	year	53.000	milli-seconds ( x⁻³ )	100.000'000	%	α	10,723.000	keV	²⁶⁴Bh	²⁶⁸Mt > [ 100 % , α , 10,723.0 keV ] > ²⁶⁴Bh						?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_109_mt_269_u	Unstable	²⁶⁹Mt	Boson	109	p	160	n	?	269.139'055'000'0	u	~ 0	%	~ 0	129.224'000'000'0	MeV	7.271'000'000'0	MeV	-	-	6.34E-9	year	200.000	milli-seconds ( x⁻³ )	?	%	α	10,530.000	keV	²⁶⁵Bh	²⁶⁹Mt > [ ? % , α , 10,530.0 keV ] > ²⁶⁵Bh						?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_109_mt_270_u	Unstable	²⁷⁰Mt	Fermion	109	p	161	n	?	270.140'657'000'0	u	~ 0	%	~ 0	129.529'000'000'0	MeV	7.273'000'000'0	MeV	-	-	6.34E-8	year	2.000	seconds ( x⁰ )	?	%	α	10,350.000	keV	²⁶⁶Bh	²⁷⁰Mt > [ ? % , α , 10,350.0 keV ] > ²⁶⁶Bh						?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_109_mt_271_u	Unstable	²⁷¹Mt	Boson	109	p	162	n	?	271.141'139'000'0	u	~ 0	%	~ 0	131.021'000'000'0	MeV	7.270'000'000'0	MeV	-	-	1.58E-7	year	4.980	seconds ( x⁰ )	?	%	α	10,140.000	keV	²⁶⁷Bh	²⁷¹Mt > [ ? % , α , 10,140.0 keV ] > ²⁶⁷Bh						?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_109_mt_272_u	Unstable	²⁷²Mt	Fermion	109	p	163	n	?	271.141'139'000'0	u	~ 0	%	~ 0	131.470'000'000'0	MeV	7.272'000'000'0	MeV	-	-	1.58E-7	year	4.980	seconds ( x⁰ )	?	%	α	10,600.000	keV	²⁶⁸Bh	²⁷²Mt > [ ? % , α , 10,600.0 keV ] > ²⁶⁸Bh	SF	?	keV	V	²⁷²Mt > [ , SF , ? keV ] > V	?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_109_mt_273_u	Unstable	²⁷³Mt	Boson	109	p	164	n	?	273.144'913'000'0	u	~ 0	%	~ 0	133.891'000'000'0	MeV	7.266'000'000'0	MeV	-	-	6.34E-7	year	20.000	seconds ( x⁰ )	?	%	α	10,820.000	keV	²⁶⁹Bh	²⁷³Mt > [ ? % , α , 10,820.0 keV ] > ²⁶⁹Bh	SF	?	keV	V	²⁷³Mt > [ , SF , ? keV ] > V	?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_109_mt_274_u	Unstable	²⁷⁴Mt	Fermion	109	p	165	n	?	274.147'492'000'0	u	~ 0	%	~ 0	134.986'000'000'0	MeV	7.264'000'000'0	MeV	-	-	6.34E-7	year	20.000	seconds ( x⁰ )	?	%	α	10,500.000	keV	²⁷⁰Bh	²⁷⁴Mt > [ ? % , α , 10,500.0 keV ] > ²⁷⁰Bh	SF	?	keV	V	²⁷⁴Mt > [ , SF , ? keV ] > V	?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_109_mt_275_u	Unstable	²⁷⁵Mt	Boson	109	p	166	n	?	275.148'647'000'0	u	~ 0	%	~ 0	137.388'000'000'0	MeV	7.259'000'000'0	MeV	-	-	9.51E-7	year	30.000	seconds ( x⁰ )	?	%	α	10,120.000	keV	²⁷¹Bh	²⁷⁵Mt > [ ? % , α , 10,120.0 keV ] > ²⁷¹Bh	SF	?	keV	V	²⁷⁵Mt > [ , SF , ? keV ] > V	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_109_mt_276_u	Unstable	²⁷⁶Mt	Fermion	109	p	167	n	?	276.151'156'000'0	u	~ 0	%	~ 0	138.463'000'000'0	MeV	7.258'000'000'0	MeV	-	-	1.27E-6	year	40.020	seconds ( x⁰ )	?	%	α	9,800.000	keV	²⁷²Bh	²⁷⁶Mt > [ ? % , α , 9,800.0 keV ] > ²⁷²Bh	SF	?	keV	V	²⁷⁶Mt > [ , SF , ? keV ] > V	?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_109_mt_277_u	Unstable	²⁷⁷Mt	Boson	109	p	168	n	?	277.152'420'000'0	u	~ 0	%	~ 0	140.801'000'000'0	MeV	7.252'000'000'0	MeV	-	-	1.90E-6	year	60.000	seconds ( x⁰ )	?	%	α	9,500.000	keV	²⁷³Bh	²⁷⁷Mt > [ ? % , α , 9,500.0 keV ] > ²⁷³Bh	SF	?	keV	V	²⁷⁷Mt > [ , SF , ? keV ] > V	?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_109_mt_278_u	Unstable	²⁷⁸Mt	Fermion	109	p	169	n	?	278.154'812'000'0	u	~ 0	%	~ 0	141.978'000'000'0	MeV	7.251'000'000'0	MeV	-	-	9.51E-7	year	30.000	seconds ( x⁰ )	?	%	α	9,100.000	keV	²⁷⁴Bh	²⁷⁸Mt > [ ? % , α , 9,100.0 keV ] > ²⁷⁴Bh	SF	?	keV	V	²⁷⁸Mt > [ , SF , ? keV ] > V	?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_109_mt_279_u	Unstable	²⁷⁹Mt	Boson	109	p	170	n	?	279.156'193'000'0	u	~ 0	%	~ 0	144.207'000'000'0	MeV	7.246'000'000'0	MeV	-	-	1.27E-5	year	400.200	seconds ( x⁰ )	?	%	α	8,700.000	keV	²⁷⁵Bh	²⁷⁹Mt > [ ? % , α , 8,700.0 keV ] > ²⁷⁵Bh	SF	?	keV	V	²⁷⁹Mt > [ , SF , ? keV ] > V										?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy

109 – Meitnerium, Mt

109 – Meitnerium, Mt

109 – Meitnerium, Mt

109 – Meitnerium, Mt

109 – Meitnerium, Mt

Spectrograph

Elemental Tile

Meitnerium

Spectrograph

Elemental Tile

Meitnerium

Spectrograph

Elemental Tile

Meitnerium

Spectrograph

Elemental Tile

Meitnerium

Spectrograph

Elemental Tile

Meitnerium