Nobelium

Nobelium (No)

Radioactive metallic transuranic element, belongs to the actinoids. Seven known isotopes exist, the most stable being No-254 with a half-life of 255 seconds. First identified with certainty by Albert Ghiorso and Glenn T. Seaborg in 1966. Unnilbium has been proposed as an alternative name.
Atomic Number102
Atomic Weight259
Mass Number248
Group
Period7
Blockf
Protons102 p+
Neutrons146 n0
Electrons102 e-
Electron shell 102 Nobelium.svg Animated Bohr Model of No (Nobelium) Enhanced Bohr Model of No (Nobelium) Bohr Model: No (Nobelium) Orbital Diagram of No (Nobelium)

Properties

Atomic Radius
Molar Volume
Covalent Radius
176 pm
Metallic Radius
Ionic Radius
110 pm
Crystal Radius
124 pm
Van der Waals Radius
246 pm
Density
9.9 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, 8, 2
Valence Electrons3
Electron Configuration[Rn] 5f14 7s2
Oxidation States2, 3
Electronegativity
Electrophilicity
Phases
PhaseSolid
Gas Phase
Boiling Point
Melting Point
1,100.15 K
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
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number46
Mendeleev Number40
Pettifor Number35
Geochemical Class
Goldschmidt Classsynthetic
Other
Gas Basicity
Dipole Polarizability
110 ± 6 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers1S0
Space Group ()

Isotopes of Nobelium

Stable Isotopes0
Unstable Isotopes17
Radioactive Isotopes16

248No

Abundance
Relative Atomic Mass
248.086623 ± 0.000241 Da
Mass Number248
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year2003
Parity+

248No Decay Modes
Decay ModeIntensity
SF (spontaneous fission)%

249No

AbundanceRadioactive ☢️
Relative Atomic Mass
249.087802 ± 0.0003 Da
Mass Number249
G-Factor
Half Life
57 ± 12 us
Spin5/2
Quadrupole Moment
Discovery Year2003
Parity+

249No Decay Modes
Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)%
α (α emission)%

250No

AbundanceRadioactive ☢️
Relative Atomic Mass
250.087565 ± 0.000215 Da
Mass Number250
G-Factor
0
Half Life
5.08 ± 0.27 us
Spin0
Quadrupole Moment
0
Discovery Year2003
Parity+

250No Decay Modes
Decay ModeIntensity
SF (spontaneous fission)100%
α (α emission)%
β+ (β+ decay; β+ = ϵ + e+)%

251No

AbundanceRadioactive ☢️
Relative Atomic Mass
251.088942 ± 0.000194 Da
Mass Number251
G-Factor
Half Life
800 ± 10 ms
Spin7/2
Quadrupole Moment
Discovery Year1967
Parity+

251No Decay Modes
Decay ModeIntensity
α (α emission)83%
β+ (β+ decay; β+ = ϵ + e+)%
SF (spontaneous fission)0.3%

252No

AbundanceRadioactive ☢️
Relative Atomic Mass
252.08896607 ± 0.000009975 Da
Mass Number252
G-Factor
0
Half Life
2.467 ± 0.016 s
Spin0
Quadrupole Moment
0
Discovery Year1967
Parity+

252No Decay Modes
Decay ModeIntensity
α (α emission)67.6%
SF (spontaneous fission)31.3%
β+ (β+ decay; β+ = ϵ + e+)1.1%

253No

AbundanceRadioactive ☢️
Relative Atomic Mass
253.09056278 ± 0.00000742 Da
Mass Number253
G-Factor
-0.11777777777778 ± 0.017777777777778
Half Life
1.57 ± 0.02 m
Spin9/2
Quadrupole Moment
5.9 ± 1.7
Discovery Year1967
Parity-

253No Decay Modes
Decay ModeIntensity
α (α emission)55%
β+ (β+ decay; β+ = ϵ + e+)%
SF (spontaneous fission)%

254No

AbundanceRadioactive ☢️
Relative Atomic Mass
254.090954211 ± 0.000010367 Da
Mass Number254
G-Factor
0
Half Life
51.2 ± 0.4 s
Spin0
Quadrupole Moment
0
Discovery Year1966
Parity+

254No Decay Modes
Decay ModeIntensity
α (α emission)90%
β+ (β+ decay; β+ = ϵ + e+)10%
SF (spontaneous fission)0.17%

255No

AbundanceRadioactive ☢️
Relative Atomic Mass
255.093196439 ± 0.000015079 Da
Mass Number255
G-Factor
Half Life
3.52 ± 0.18 m
Spin1/2
Quadrupole Moment
0
Discovery Year1967
Parity+

255No Decay Modes
Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)70%
α (α emission)30%

256No

AbundanceRadioactive ☢️
Relative Atomic Mass
256.094281912 ± 0.000008103 Da
Mass Number256
G-Factor
0
Half Life
2.91 ± 0.05 s
Spin0
Quadrupole Moment
0
Discovery Year1963
Parity+

256No Decay Modes
Decay ModeIntensity
α (α emission)99.45%
SF (spontaneous fission)0.55%
ϵ (electron capture)%

257No

AbundanceRadioactive ☢️
Relative Atomic Mass
257.096884203 ± 0.000006652 Da
Mass Number257
G-Factor
Half Life
24.5 ± 0.5 s
Spin3/2
Quadrupole Moment
Discovery Year1967
Parity+

257No Decay Modes
Decay ModeIntensity
α (α emission)85%
β+ (β+ decay; β+ = ϵ + e+)15%
SF (spontaneous fission)%

258No

AbundanceRadioactive ☢️
Relative Atomic Mass
258.098205 ± 0.000107 Da
Mass Number258
G-Factor
0
Half Life
1.23 ± 0.12 ms
Spin0
Quadrupole Moment
0
Discovery Year1989
Parity+

258No Decay Modes
Decay ModeIntensity
SF (spontaneous fission)100%
α (α emission)%

259No

AbundanceRadioactive ☢️
Relative Atomic Mass
259.100998364 ± 0.000006829 Da
Mass Number259
G-Factor
Half Life
58 ± 5 m
Spin9/2
Quadrupole Moment
Discovery Year1973
Parity+

259No Decay Modes
Decay ModeIntensity
α (α emission)75%
ϵ (electron capture)25%
SF (spontaneous fission)10%

260No

AbundanceRadioactive ☢️
Relative Atomic Mass
260.102641 ± 0.000215 Da
Mass Number260
G-Factor
0
Half Life
106 ± 8 ms
Spin0
Quadrupole Moment
0
Discovery Year1985
Parity+

260No Decay Modes
Decay ModeIntensity
SF (spontaneous fission)100%

261No

AbundanceRadioactive ☢️
Relative Atomic Mass
261.105696 ± 0.000215 Da
Mass Number261
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

261No Decay Modes
Decay ModeIntensity
α (α emission)%

262No

AbundanceRadioactive ☢️
Relative Atomic Mass
262.107463 ± 0.000387 Da
Mass Number262
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year1988
Parity+

262No Decay Modes
Decay ModeIntensity
SF (spontaneous fission)100%
α (α emission)%

263No

AbundanceRadioactive ☢️
Relative Atomic Mass
263.110714 ± 0.000526 Da
Mass Number263
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

263No Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

264No

AbundanceRadioactive ☢️
Relative Atomic Mass
264.112734 ± 0.000634 Da
Mass Number264
G-Factor
0
Half Life
Spin0
Quadrupole Moment
0
Discovery Year
Parity+

264No Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

History

Nobelium was discovered by Albert Ghiorso, Glenn T. Seaborg, John R. Walton and Torbjørn Sikkeland in 1958 at the University of California, Berkeley. It was produced by the bombardment of curium with carbon atoms. It was correctly identified in 1966 by scientists at the Flerov Laboratory of Nuclear Reactions in Dubna, Soviet Union. Named after of Alfred Nobel, Swedish chemist who discovered dynamite and founder of the Nobel Prizes

DiscoverersNobel Institute for Physics
Discovery LocationSweden
Discovery Year1957
Etymology (Name Origin)Named in honor of Alfred Nobel, who invented dynamite and founded Nobel prize.
Pronunciationno-BELL-i-em (English)
Nobelium is harmful due to its radioactivity
Nobelium is a divalent ion in aqueous solution

Uses

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

Sources

Made by bombarding curium with carbon-13

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