Hassium

Hassium (Hs)

Radioactive transition metal first synthesized in 1984 by a German research team led by Peter Armbruster and Gottfried Muenzenberg at the Institute for Heavy Ion Research at Darmstadt.
Atomic Number108
Atomic Weight269
Mass Number263
Group8
Period7
Blockd
Protons108 p+
Neutrons155 n0
Electrons108 e-
Electron shell 108 Hassium.svg Animated Bohr Model of Hs (Hassium) Enhanced Bohr Model of Hs (Hassium) Bohr Model: Hs (Hassium) Orbital Diagram of Hs (Hassium)

Properties

Atomic Radius
Molar Volume
Covalent Radius
134 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density
40.7 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, 14, 2
Valence Electrons0
Electron Configuration[Rn] 5f14 6d6 7s2
Oxidation States8
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 Number62
Pettifor Number
Geochemical Class
Goldschmidt Classsynthetic
Other
Gas Basicity
Dipole Polarizability
36 ± 4 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers5D4
Space Group ()

Isotopes of Hassium

Stable Isotopes0
Unstable Isotopes18
Radioactive Isotopes18

263Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
263.128479 ± 0.000212 Da
Mass Number263
G-Factor
Half Life
0.9 ± 0.4 ms
Spin3/2
Quadrupole Moment
Discovery Year2009
Parity+

263Hs Decay Modes
Decay ModeIntensity
α (α emission)100%
SF (spontaneous fission)%

264Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
264.12835633 ± 0.000031005 Da
Mass Number264
G-Factor
0
Half Life
0.7 ± 0.3 s
Spin0
Quadrupole Moment
0
Discovery Year1986
Parity+

264Hs Decay Modes
Decay ModeIntensity
α (α emission)70%
SF (spontaneous fission)30%

265Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
265.129791744 ± 0.000025719 Da
Mass Number265
G-Factor
Half Life
1.96 ± 0.16 ms
Spin3/2
Quadrupole Moment
Discovery Year1984
Parity+

265Hs Decay Modes
Decay ModeIntensity
α (α emission)100%
SF (spontaneous fission)%

266Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
266.130048783 ± 0.000029099 Da
Mass Number266
G-Factor
0
Half Life
3 ± 0.6 ms
Spin0
Quadrupole Moment
0
Discovery Year2001
Parity+

266Hs Decay Modes
Decay ModeIntensity
α (α emission)76%
SF (spontaneous fission)24%

267Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
267.131678 ± 0.000102 Da
Mass Number267
G-Factor
Half Life
55 ± 11 ms
Spin
Quadrupole Moment
Discovery Year1995
Parity

267Hs Decay Modes
Decay ModeIntensity
α (α emission)80%
SF (spontaneous fission)%

268Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
268.132011 ± 0.000322 Da
Mass Number268
G-Factor
0
Half Life
1.4 ± 1.1 s
Spin0
Quadrupole Moment
0
Discovery Year2010
Parity+

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

269Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
269.133649 ± 0.000141 Da
Mass Number269
G-Factor
Half Life
15 ± 7 s
Spin9/2
Quadrupole Moment
Discovery Year1996
Parity+

269Hs Decay Modes
Decay ModeIntensity
α (α emission)100%

270Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
270.134313 ± 0.000266 Da
Mass Number270
G-Factor
0
Half Life
9 ± 4 s
Spin0
Quadrupole Moment
0
Discovery Year2003
Parity+

270Hs Decay Modes
Decay ModeIntensity
α (α emission)100%
SF (spontaneous fission)%

271Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
271.137082 ± 0.000296 Da
Mass Number271
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year2008
Parity

271Hs Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

272Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
272.138492 ± 0.000547 Da
Mass Number272
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year
Parity+

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

273Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
273.141458 ± 0.000401 Da
Mass Number273
G-Factor
Half Life
1,060 ± 500 ms
Spin
Quadrupole Moment
Discovery Year2010
Parity

273Hs Decay Modes
Decay ModeIntensity
α (α emission)100%
SF (spontaneous fission)%

274Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
274.143217 ± 0.000504 Da
Mass Number274
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year
Parity+

274Hs Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

275Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
275.14653 ± 0.000637 Da
Mass Number275
G-Factor
Half Life
280 ± 130 ms
Spin
Quadrupole Moment
Discovery Year2004
Parity

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

276Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
276.148348 ± 0.000773 Da
Mass Number276
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year
Parity+

276Hs Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

277Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
277.151772 ± 0.00048 Da
Mass Number277
G-Factor
Half Life
12 ± 9 ms
Spin
Quadrupole Moment
Discovery Year2010
Parity

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

278Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
278.153753 ± 0.000322 Da
Mass Number278
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year2016
Parity+

278Hs Decay Modes
Decay ModeIntensity
SF (spontaneous fission)100%
α (α emission)%

279Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
279.157274 ± 0.000644 Da
Mass Number279
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

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

280Hs

AbundanceRadioactive ☢️
Relative Atomic Mass
280.159335 ± 0.000644 Da
Mass Number280
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year
Parity+

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

History

Hassium was first synthesized in 1984 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 lead-208 with accelerated nuclei of iron-58 to produce 3 atoms of the isotope hassium-265. From the Latin word Hassias meaning Hess, the German state

DiscoverersHeavy Ion Research Laboratory (HIRL)
Discovery LocationGermany
Discovery Year1984
Etymology (Name Origin)Named in honor of Henri Hess, Swiss born Russian chemist known for work in thermodydamics.
PronunciationHES-i-em (English)
Hassium is harmful due to its radioactivity
More than 100 atoms of hassium have been synthesized to date

Uses

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

Sources

Formed by the bombardment of lead-208 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