Seaborgium (Sg)

Half-life of 0.9 +/- 0.2 s. Discovered by the Joint Institute for Nuclear Research at Dubna (U.S.S.R.) in June of 1974. Its existence was confirmed by the Lawrence Berkeley Laboratory and Livermore National Laboratory in September of 1974.

Atomic Number	106
Atomic Weight	271
Mass Number	258

Group	6
Period	7
Block	d

Protons	106 p⁺
Neutrons	152 n⁰
Electrons	106 e^-

Properties

Energy
Atomic Radius
Molar Volume
Covalent Radius	143 pm 128 pm 121 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density	35 g/cm³
Proton Affinity
Electron Affinity
Ionization Energy	7.8 eV/particle 17.1 eV/particle 25.8 eV/particle 35.5 eV/particle 47.2 eV/particle 59.3 eV/particle 109 eV/particle 122 eV/particle 152 eV/particle 170 eV/particle 200 eV/particle 224 eV/particle 251 eV/particle 285 eV/particle 306 eV/particle 339 eV/particle 885 eV/particle 921 eV/particle 958 eV/particle 998 eV/particle 1,036 eV/particle 1,073 eV/particle 1,143 eV/particle 1,181 eV/particle 1,223 eV/particle 1,263 eV/particle 4,095 eV/particle 4,178 eV/particle 4,267 eV/particle 4,360 eV/particle 4,450 eV/particle 4,540 eV/particle 4,750 eV/particle 4,840 eV/particle 4,940 eV/particle 5,030 eV/particle 5,410 eV/particle 5,490 eV/particle 5,590 eV/particle 5,680 eV/particle 6,460 eV/particle 6,570 eV/particle 6,840 eV/particle 6,950 eV/particle 10,680 eV/particle 10,870 eV/particle 11,080 eV/particle 11,300 eV/particle 11,510 eV/particle 11,710 eV/particle 12,320 eV/particle 12,540 eV/particle 12,780 eV/particle 12,990 eV/particle 13,600 eV/particle 13,800 eV/particle 14,000 eV/particle 14,200 eV/particle 16,600 eV/particle 16,800 eV/particle 17,300 eV/particle 17,500 eV/particle 34,500 eV/particle 35,000 eV/particle 35,600 eV/particle 36,100 eV/particle 44,900 eV/particle 45,700 eV/particle 46,600 eV/particle 185,839 eV/particle

Heat of Vaporization
Heat of Fusion
Heat of Formation
Electrons
Electron Shells	2, 8, 18, 32, 32, 12, 2

Valence Electrons	2
Electron Configuration	[Rn] 5f¹⁴ 6d⁴ 7s²

Oxidation States	0, 6
Electronegativity
Electrophilicity
Phases
Phase	Solid
Gas Phase
Boiling Point
Melting Point
Critical Pressure
Critical Temperature
Triple Point
Visual
Color	Colorless #d90045
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
Category	Transition metals, Transition metals
CAS Group	VIA
IUPAC Group	VIB
Glawe Number
Mendeleev Number	54
Pettifor Number
Geochemical Class
Goldschmidt Class	synthetic
Other
Gas Basicity
Dipole Polarizability	40 ± 4 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers	5D0
Space Group	()

Isotopes of Seaborgium

Stable Isotopes	0
Unstable Isotopes	16
Radioactive Isotopes	16

²⁵⁸Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	258.11304 ± 0.000443 Da
Mass Number	258
G-Factor	0
Half Life	2.7 ± 0.5 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1997
Parity	+

²⁵⁸Sg Decay Modes

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

²⁵⁹Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	259.114353 ± 0.000194 Da
Mass Number	259
G-Factor
Half Life	402 ± 56 ms
Spin	11/2
Quadrupole Moment
Discovery Year	1985
Parity	-

²⁵⁹Sg Decay Modes

Decay Mode	Intensity
α (α emission)	100%
SF (spontaneous fission)	%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	%

²⁶⁰Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	260.114383435 ± 0.000022045 Da
Mass Number	260
G-Factor	0
Half Life	4.95 ± 0.33 ms
Spin	0
Quadrupole Moment	0
Discovery Year	1984
Parity	+

²⁶⁰Sg Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	71%
α (α emission)	29%

²⁶¹Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	261.115948135 ± 0.000019853 Da
Mass Number	261
G-Factor
Half Life	183 ± 5 ms
Spin	3/2
Quadrupole Moment
Discovery Year	1984
Parity	+

²⁶¹Sg Decay Modes

Decay Mode	Intensity
α (α emission)	98.1%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	1.3%
SF (spontaneous fission)	0.6%

²⁶²Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	262.116338978 ± 0.000023797 Da
Mass Number	262
G-Factor	0
Half Life	10.3 ± 1.7 ms
Spin	0
Quadrupole Moment	0
Discovery Year	2001
Parity	+

²⁶²Sg Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	94%
α (α emission)	%

²⁶³Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	263.118299 ± 0.000101 Da
Mass Number	263
G-Factor
Half Life	940 ± 140 ms
Spin	3/2
Quadrupole Moment
Discovery Year	1974
Parity	+

²⁶³Sg Decay Modes

Decay Mode	Intensity
α (α emission)	87%
SF (spontaneous fission)	13%

²⁶⁴Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	264.11893 ± 0.000304 Da
Mass Number	264
G-Factor	0
Half Life	78 ± 25 ms
Spin	0
Quadrupole Moment	0
Discovery Year	2006
Parity	+

²⁶⁴Sg Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	80%
α (α emission)	%

²⁶⁵Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	265.121089 ± 0.000149 Da
Mass Number	265
G-Factor
Half Life	9.2 ± 1.6 s
Spin	11/2
Quadrupole Moment
Discovery Year	1994
Parity	-

²⁶⁵Sg Decay Modes

Decay Mode	Intensity
α (α emission)	50%
SF (spontaneous fission)	%

²⁶⁶Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	266.121973 ± 0.000263 Da
Mass Number	266
G-Factor	0
Half Life	390 ± 110 ms
Spin	0
Quadrupole Moment	0
Discovery Year	2006
Parity	+

²⁶⁶Sg Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	90%

²⁶⁷Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	267.124323 ± 0.000281 Da
Mass Number	267
G-Factor
Half Life	1.8 ± 0.7 m
Spin
Quadrupole Moment
Discovery Year	2008
Parity

²⁶⁷Sg Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	83%
α (α emission)	17%

²⁶⁸Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	268.125389 ± 0.000504 Da
Mass Number	268
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year
Parity	+

²⁶⁸Sg Decay Modes

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

²⁶⁹Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	269.128495 ± 0.000395 Da
Mass Number	269
G-Factor
Half Life	5 ± 2 m
Spin
Quadrupole Moment
Discovery Year	2010
Parity

²⁶⁹Sg Decay Modes

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

²⁷⁰Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	270.130362 ± 0.000492 Da
Mass Number	270
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year
Parity	+

²⁷⁰Sg Decay Modes

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

²⁷¹Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	271.133782 ± 0.000634 Da
Mass Number	271
G-Factor
Half Life	2.2 ± 1.1 m
Spin
Quadrupole Moment
Discovery Year	2004
Parity

²⁷¹Sg Decay Modes

Decay Mode	Intensity
α (α emission)	42%
SF (spontaneous fission)	58%

²⁷²Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	272.135825 ± 0.000743 Da
Mass Number	272
G-Factor	0
Half Life
Spin	0
Quadrupole Moment	0
Discovery Year
Parity	+

²⁷²Sg Decay Modes

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

²⁷³Sg

Abundance	Radioactive ☢️
Relative Atomic Mass	273.139475 ± 0.000429 Da
Mass Number	273
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

²⁷³Sg Decay Modes

Decay Mode	Intensity
SF (spontaneous fission)	%

History

Scientists working at the Joint Institute for Nuclear Research in Dubna, USSR reported their discovery of element 106 in June 1974. Synthesis was also reported in September 1974 at the Lawrence Berkeley Laboratory by the workers of the Lawrence Berkeley and Livermore Laboratories led by Albert Ghiorso and E. Kenneth Hulet. It was produced by collisions of californium-249 with oxygen atoms. Named after Glenn Seaborg, American nuclear chemist and Nobel prize winner

Discoverers	Soviet Nuclear Research/ U. of Cal at Berkeley
Discovery Location	USSR/United States
Discovery Year	1974
Etymology (Name Origin)	Named in honor of Glenn Seaborg, American physical chemist known for research on transuranium elements.
Pronunciation	see-BORG-i-em (English)

Seaborgium is harmful due to its radioactivity

There are 12 known isotopes of seaborgium

Uses

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

Sources

Made by bombarding californium-249 with oxygen-18.

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

Seaborgium on ChemicalAid

Australian Educational Vocabulary ID	scot/3573
CAS Registry Number	54038-81-2
DSSTOX compound identifier	DTXCID501323012
DSSTox substance ID	DTXSID90893064
Den Store Danske ID	seaborgium
Elhuyar ZTH ID	064403
Encyclopædia Britannica Online ID	science/seaborgium
Freebase ID	/m/025sgk0
GND ID	4355423-4
Gran Enciclopèdia Catalana ID	0276445
Great Russian Encyclopedia Online ID	3660588
KBpedia ID	Seaborgium
Library of Congress authority ID	sh2004005779
National Library of Israel J9U ID	987007559163905171
OmegaWiki Defined Meaning	359210
Store norske leksikon ID	seaborgium

Seaborgium (Sg)

Properties

Isotopes of Seaborgium

258Sg

258Sg Decay Modes

259Sg

259Sg Decay Modes

260Sg

260Sg Decay Modes

261Sg

261Sg Decay Modes

262Sg

262Sg Decay Modes

263Sg

263Sg Decay Modes

264Sg

264Sg Decay Modes

265Sg

265Sg Decay Modes

266Sg

266Sg Decay Modes

267Sg

267Sg Decay Modes

268Sg

268Sg Decay Modes

269Sg

269Sg Decay Modes

270Sg

270Sg Decay Modes

271Sg

271Sg Decay Modes

272Sg

272Sg Decay Modes

273Sg

273Sg Decay Modes