Hassium is a synthetic element, radioactive and with the most stable known isotopes are 269Hs having a half-life of 9.7 seconds and 277mHs, with a half-life of 11 minutes. More than 100 atoms of hassium have been synthesized to date. In bulk quantities, hassium is expected to be a silvery metal that reacts readily with oxygen in the air, forming a volatile tetroxide.

1984 by Workers at Gesellschaft für Schwerionenforschung, Germany.

DISCOVERY

Latin 'Hassias' meaning 'Hess', the German state.

ETYMOLOGY

Hassium

Element

Hs

Symbol

108

108 Atomic Number

Atomic Number

Transition Metal

Classification

54037-57-9

CAS Number

-

Elemental Colour

-

Refractive Index

-

Poisson Ratio

6.589 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

270.134'290'0

Atomic Weight

-

Atomic Radius

134 pm

Covalent Radius Single Bond

125 pm

Covalent Radius Double Bond

118 pm

Covalent Radius Triple Bond

126 pm

Van der Waals Radius

[Rn]7s²5f¹⁴6d⁶

Electron Configuration

Hexagonal, Close Packed Single

Crystal Structure

41.000'00 g/cm³

Density as Solid

-

Density as Liquid

-

Density as Gas

-

Space Group Name

-

Space Group Number

-

Lattice Angles

-

Lattice Constants

1.11 hour

Half Life

1.39 hour

Lifetime

6d⁶ = 6, 2, -2, -1/2

Quantum Numbers

-

Neutron Cross Section

-

Neutron Mass Absorption

Stable Isotopes

NONE

Unstable Isotopes

Isotopes Overview

Isotope	Stability	Symbol	Type	Protons		Neutrons		Spin	Parity	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_108_hs_263_u	Unstable	²⁶³Hs	Fermion	108	p	155	n	7/2	1	263.128'558'000'0	u	~ 0	%	~ 0	134.368'000'000'0	MeV	7.278'000'000'0	MeV	-	-	3.17E-11	year	1.000	milli-seconds ( x⁻³ )	100.000'000	%	α	10,670.000	keV	²⁵⁹Sg	²⁶³Hs > [ 100 % , α , 10,670.0 keV ] > ²⁵⁹Sg						43.033'401	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb
Isotope_108_hs_264_u	Unstable	²⁶⁴Hs	Boson	108	p	156	n	0	1	264.128'394'885'0	u	~ 0	%	~ 0	119.751'000'000'0	MeV	7.295'000'000'0	MeV	-	-	1.71E-11	year	540.000	micro-seconds ( x⁻⁶ )	50.000'000	%	SF	?	keV	V	²⁶⁴Hs > [ 50 % , SF , ? keV ] > V	α	10,590.000	keV	²⁶⁰Sg	²⁶⁴Hs > [ , α , 10,590.0 keV ] > ²⁶⁰Sg	0.043'089	%	²⁰⁸Pb	0.000'000	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_108_hs_265_u	Unstable	²⁶⁵Hs	Fermion	108	p	157	n	9/2	1	265.130'085'000'0	u	~ 0	%	~ 0	119.599'066'000'0	MeV	7.298'239'000'0	MeV	-	-	6.65E-11	year	2.100	milli-seconds ( x⁻³ )	100.000'000	%	α	10,586.200	keV	²⁶¹Sg	²⁶⁵Hs > [ 100 % , α , 10,586.2 keV ] > ²⁶¹Sg	SF	?	keV	V	²⁶⁵Hs > [ , SF , ? keV ] > V	99.476'033	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_108_hs_266_u	Unstable	²⁶⁶Hs	Boson	108	p	158	n	0	1	266.130'097'000'0	u	~ 0	%	~ 0	121.173'000'000'0	MeV	7.295'000'000'0	MeV	-	-	8.56E-11	year	2.700	milli-seconds ( x⁻³ )	98.600'000	%	α	10,335.600	keV	²⁶²Sg	²⁶⁶Hs > [ 98.6 % , α , 10,335.6 keV ] > ²⁶²Sg	SF	?	keV	V	²⁶⁶Hs > [ , SF , ? keV ] > V	2.813'680	%	²⁰⁶Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_108_hs_267_u	Unstable	²⁶⁷Hs	Fermion	108	p	159	n	3/2	1	267.131'789'000'0	u	~ 0	%	~ 0	121.185'000'000'0	MeV	7.298'000'000'0	MeV	-	-	1.01E-9	year	32.000	milli-seconds ( x⁻³ )	100.000'000	%	α	10,120.000	keV	²⁶³Sg	²⁶⁷Hs > [ 100 % , α , 10,120.0 keV ] > ²⁶³Sg						64.743'399	%	²⁰⁷Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁶Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁵⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_108_hs_268_u	Unstable	²⁶⁸Hs	Boson	108	p	160	n	0	1	268.132'162'000'0	u	~ 0	%	~ 0	122.761'000'000'0	MeV	7.295'000'000'0	MeV	-	-	6.34E-8	year	2.000	seconds ( x⁰ )	?	%	α	9,900.000	keV	²⁶⁴Sg	²⁶⁸Hs > [ ? % , α , 9,900.0 keV ] > ²⁶⁴Sg						?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	0.000'000	%	²⁰⁸Pb
Isotope_108_hs_269_u	Unstable	²⁶⁹Hs	Fermion	108	p	161	n	?	0	269.134'056'000'0	u	~ 0	%	~ 0	123.108'000'000'0	MeV	7.297'000'000'0	MeV	-	-	8.56E-7	year	27.000	seconds ( x⁰ )	100.000'000	%	α	9,630.000	keV	²⁶⁵Sg	²⁶⁹Hs > [ 100 % , α , 9,630.0 keV ] > ²⁶⁵Sg						30.016'825	%	²⁰⁵Tl	0.000'000	%	²⁰⁷Pb
Isotope_108_hs_270_u	Unstable	²⁷⁰Hs	Boson	108	p	162	n	0	1	270.134'650'000'0	u	~ 0	%	~ 0	124.872'000'000'0	MeV	7.293'000'000'0	MeV	-	-	9.51E-7	year	30.000	seconds ( x⁰ )	100.000'000	%	α	9,297.900	keV	²⁶⁶Sg	²⁷⁰Hs > [ 100 % , α , 9,297.9 keV ] > ²⁶⁶Sg						0.000'003	%	²⁰⁶Pb	0.000'000	%	²⁰⁵Tl	0.000'000	%	²⁰⁸Pb
Isotope_108_hs_271_u	Unstable	²⁷¹Hs	Fermion	108	p	163	n	?	0	271.137'657'000'0	u	~ 0	%	~ 0	125.426'000'000'0	MeV	7.294'000'000'0	MeV	-	-	1.27E-6	year	40.020	seconds ( x⁰ )	?	%	α	9,900.000	keV	²⁶⁷Sg	²⁷¹Hs > [ ? % , α , 9,900.0 keV ] > ²⁶⁷Sg	SF	?	keV	V	²⁷¹Hs > [ , SF , ? keV ] > V	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	0.000'000	%	¹⁶⁰Dy	0.000'000	%	¹⁴⁰Ce	?	%	¹⁷²Yb	?	%	¹⁵⁶Hf	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_108_hs_272_u	Unstable	²⁷²Hs	Boson	108	p	164	n	0	1	272.139'052'000'0	u	~ 0	%	~ 0	128.226'000'000'0	MeV	7.286'000'000'0	MeV	-	-	1.27E-6	year	40.020	seconds ( x⁰ )	?	%	α	10,100.000	keV	²⁶⁸Sg	²⁷²Hs > [ ? % , α , 10,100.0 keV ] > ²⁶⁸Sg	SF	?	keV	V	²⁷²Hs > [ , SF , ? keV ] > V										?	%	²⁰⁶Pb
Isotope_108_hs_273_u	Unstable	²⁷³Hs	Fermion	108	p	165	n	3/2	1	273.141'986'000'0	u	~ 0	%	~ 0	129.526'000'000'0	MeV	7.284'000'000'0	MeV	-	-	1.58E-6	year	49.980	seconds ( x⁰ )	?	%	α	9,900.000	keV	²⁶⁹Sg	²⁷³Hs > [ ? % , α , 9,900.0 keV ] > ²⁶⁹Sg						?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_108_hs_274_u	Unstable	²⁷⁴Hs	Boson	108	p	166	n	0	1	274.143'131'000'0	u	~ 0	%	~ 0	132.259'000'000'0	MeV	7.277'000'000'0	MeV	-	-	1.90E-6	year	60.000	seconds ( x⁰ )	?	%	α	9,500.000	keV	²⁷⁰Sg	²⁷⁴Hs > [ ? % , α , 9,500.0 keV ] > ²⁷⁰Sg	SF	?	keV	V	²⁷⁴Hs > [ , SF , ? keV ] > V	?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_108_hs_275_u	Unstable	²⁷⁵Hs	Fermion	108	p	167	n	?	0	275.145'952'000'0	u	~ 0	%	~ 0	133.325'000'000'0	MeV	7.276'000'000'0	MeV	-	-	9.51E-7	year	30.000	seconds ( x⁰ )	?	%	α	9,200.000	keV	²⁷¹Sg	²⁷⁵Hs > [ ? % , α , 9,200.0 keV ] > ²⁷¹Sg	SF	?	keV	V	²⁷⁵Hs > [ , SF , ? keV ] > V										?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_108_hs_276_u	Unstable	²⁷⁶Hs	Boson	108	p	168	n	0	1	276.147'208'000'0	u	~ 0	%	~ 0	135.953'000'000'0	MeV	7.270'000'000'0	MeV	-	-	2.11E-6	year	66.600	seconds ( x⁰ )	?	%	α	8,800.000	keV	²⁷²Sg	²⁷⁶Hs > [ ? % , α , 8,800.0 keV ] > ²⁷²Sg	SF	?	keV	V	²⁷⁶Hs > [ , SF , ? keV ] > V
Isotope_108_hs_277_u	Unstable	²⁷⁷Hs	Fermion	108	p	169	n	3/2	1	277.149'841'000'0	u	~ 0	%	~ 0	137.123'000'000'0	MeV	7.268'000'000'0	MeV	-	-	1.27E-6	year	40.020	seconds ( x⁰ )

108 – Hassium, Hs

108 – Hassium, Hs

108 – Hassium, Hs

108 – Hassium, Hs

108 – Hassium, Hs

Spectrograph

Elemental Tile

Hassium

Spectrograph

Elemental Tile

Hassium

Spectrograph

Elemental Tile

Hassium

Spectrograph

Elemental Tile

Hassium

Spectrograph

Elemental Tile

Hassium