Lawrencium

Lawrencium (Lr)

Appearance unknown, however it is most likely silvery-white or grey and metallic. Lawrencium is a synthetic rare-earth metal. There are eight known radioisotopes, the most stable being Lr-262 with a half-life of 3.6 hours. Due to the short half-life of lawrencium, and its radioactivity, there are no known uses for it. Identified by Albert Ghiorso in 1961 at Berkeley. It was produced by bombarding californium with boron ions. The name is temporary IUPAC nomenclature, the origin of the name comes from Ernest O. Lawrence, the inventor of the cyclotron. If sufficient amounts of lawrencium were produced, it would pose a radiation hazard.
Atomic Number103
Atomic Weight262
Mass Number251
Group
Period7
Blockf
Protons103 p+
Neutrons148 n0
Electrons103 e-
Electron shell 103 Lawrencium.svg Animated Bohr Model Enhanced Bohr Model Bohr Model Orbital Diagram

Properties

Atomic Radius
Atomic Volume
Covalent Radius
161 pm
Metallic Radius
Ionic Radius
107.4 pm
Crystal Radius
121.4 pm
Van der Waals radius
246 pm
Density
15.6 g/cm³
Boiling Point
Melting Point
Electrons per shell2, 8, 18, 32, 32, 8, 3
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
320 a₀
C6 Dispersion Coefficient
Oxidation States3
Color
Colorless
Crystal Structure ()
Lattice Constant
Bulk Modulus
Electrical Resistivity
Electron Configuration[Rn] 5f14 7s2 7p1
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, Transition metals
CAS Group
IUPAC Group
Glawe Number47
Mendeleev Number42
Pettifor Number34
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 Lawrencium

Stable Isotopes
Unstable Isotopes
251Lr 252Lr 253Lr 254Lr 255Lr 256Lr 257Lr 258Lr 259Lr 260Lr 261Lr 262Lr 263Lr 264Lr 265Lr 266Lr

History

Lawrencium was discovered by Albert Ghiorso, Torbjørn Sikkeland, Almon Larsh and Robert M. Latimer in 1961 at the University of California, Berkeley. It was produced by the bombardment of californium with boron atoms. Lawrencium was the last member of the actinide series to be discovered. Named after Ernest O. Lawrence, inventor of the cyclotron

DiscoverersA.Ghiorso, T.Sikkeland, A.E.Larsh, R.M.Latimer
Discovery LocationUnited States
Discovery Year1961
Name OriginNamed in honor of Ernest O. Lawrence, inventor of the cyclotron.
Lawrencium is harmful due to its radioactivity
Lawrencium is a trivalent ion in aqueous solution

Uses

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

Sources

Produced by bombarding californium with boron ions.