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 Enhanced Bohr Model Bohr Model Orbital Diagram

Properties

Atomic Radius
Atomic Volume
Covalent Radius
176 pm
Metallic Radius
Ionic Radius
110.00000000000001 pm
Crystal Radius
124 pm
Van der Waals radius
246 pm
Density
9.9 g/cm³
Boiling Point
Melting Point
1,100 K
Electrons per shell2, 8, 18, 32, 32, 8, 2
Electronegativity
Electrophilicity
Proton Affinity
Electron Affinity
Ionization Potential
Heat of Vaporization
Heat of Fusion
Heat of Formation
Molar Heat Capacity
Specific Heat Capacity
Thermal Conductivity
Gas Basicity
Dipole Polarizability
110 a₀
C6 Dispersion Coefficient
Oxidation States2, 3
Color
Colorless
Crystal Structure ()
Lattice Constant
Bulk Modulus
Electrical Resistivity
Electron Configuration[Rn] 5f14 7s2
Magnetic Ordering
Magnetic Susceptibility
PhaseSolid
Poisson Ratio
Shear Modulus
Young's Modulus
Allotropes
Alternate Names
Adiabatic Index
Appearance
Electric Conductivity
Critical Pressure
Critical Temperature
Curie Point
Electrical
Hardness
Magnetic Susceptibility
Magnetic
Neel Point
Neutron Cross Section
Neutron Mass Absorption
Gas Phase
Quantum Numbers
Refractive Index
Space Group
Speed of Sound
Superconducting Point
Thermal Expansion
Valence Electrons
Classification
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number46
Mendeleev Number40
Pettifor Number35
Geochemical Class
Goldschmidt Classsynthetic
Radioactivity
RadioactiveYes ☢️
Decay Mode
Half-Life
Lifetime
Abundance
Abundance in Earth's crust
Abundance in Oceans
Abundance in Human Body
Abundance in Meteor
Abundance in Sun
Abundance in Universena

Isotopes of Nobelium

Stable Isotopes
Unstable Isotopes
248No 249No 250No 251No 252No 253No 254No 255No 256No 257No 258No 259No 260No 261No 262No 263No 264No

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
Name OriginNamed in honor of Alfred Nobel, who invented dynamite and founded Nobel prize.
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