Roentgenium

Roentgenium (Rg)

chemical element with atomic number 111
Atomic Number111
Atomic Weight281
Mass Number272
Group11
Period7
Blockd
Protons111 p+
Neutrons161 n0
Electrons111 e-
Electron shell 111 Roentgenium.svg Animated Bohr Model Enhanced Bohr Model Bohr Model Orbital Diagram

Properties

Atomic Radius
Atomic Volume
Covalent Radius
121 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals radius
Density
28.7 g/cm³
Boiling Point
Melting Point
Electrons per shell2, 8, 18, 32, 32, 17, 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
32 a₀
C6 Dispersion Coefficient
Oxidation States-1, 1, 3, 5
Color
Colorless
Crystal Structure ()
Lattice Constant
Bulk Modulus
Electrical Resistivity
Electron Configuration[Rn] 5f14 6d9 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
CategoryTransition metals, Transition metals
CAS GroupIB
IUPAC GroupIB
Glawe Number
Mendeleev Number74
Pettifor Number
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 Roentgenium

Stable Isotopes
Unstable Isotopes
272Rg 273Rg 274Rg 275Rg 276Rg 277Rg 278Rg 279Rg 280Rg 281Rg 282Rg 283Rg

History

Roentgenium was first synthesized by an international team led by Sigurd Hofmann at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt, Germany in 1994. The team bombarded a target of bismuth-209 with accelerated nuclei of nickel-64 and detected a single atom of the isotope roentgenium-272. Named after Wilhelm Conrad Röntgen, the German physicist

DiscoverersHeavy Ion Research Laboratory (HIRL)
Discovery LocationGermany
Discovery Year1994
Name OriginNamed in honor of the physicist Wilhelm Roentgen.
Roentgenium is harmful due to its radioactivity
Roentgenium has no stable or naturally-occurring isotopes

Uses

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

Sources

Made by bombarding bismuth-209 with nickel-60.