Roentgenium

Roentgenium (Rg)

Atomic Number111
Atomic Weight281
Mass Number272
Group11
Period7
Blockd
Protons111 p+
Neutrons161 n0
Electrons111 e-
Electron shell 111 Roentgenium.svg Animated Bohr Model of Rg (Roentgenium) Enhanced Bohr Model of Rg (Roentgenium) Bohr Model: Rg (Roentgenium) Orbital Diagram of Rg (Roentgenium)

Properties

Atomic Radius
Molar Volume
Covalent Radius
121 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density
28.7 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, 17, 2
Valence Electrons0
Electron Configuration[Rn] 5f14 6d9 7s2
Oxidation States
Electronegativity
Electrophilicity
Phases
PhaseSolid
Gas Phase
Boiling Point
Melting Point
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
CategoryTransition metals, Transition metals
CAS GroupIB
IUPAC GroupIB
Glawe Number
Mendeleev Number74
Pettifor Number
Geochemical Class
Goldschmidt Classsynthetic
Other
Gas Basicity
Dipole Polarizability
32 ± 6 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers2S1/2
Space Group ()

Isotopes of Roentgenium

Stable Isotopes0
Unstable Isotopes15
Radioactive Isotopes15

272Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
272.153273 ± 0.000251 Da
Mass Number272
G-Factor
Half Life
4.2 ± 1.1 ms
Spin
Quadrupole Moment
Discovery Year1995
Parity

272Rg Decay Modes
Decay ModeIntensity
α (α emission)100%

273Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
273.153393 ± 0.000429 Da
Mass Number273
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

273Rg Decay Modes
Decay ModeIntensity
α (α emission)%

274Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
274.155247 ± 0.000225 Da
Mass Number274
G-Factor
Half Life
20 ± 11 ms
Spin
Quadrupole Moment
Discovery Year2004
Parity

274Rg Decay Modes
Decay ModeIntensity
α (α emission)100%

275Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
275.156088 ± 0.000479 Da
Mass Number275
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

275Rg Decay Modes
Decay ModeIntensity
α (α emission)%

276Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
276.158226 ± 0.000675 Da
Mass Number276
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

276Rg Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

277Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
277.159322 ± 0.000504 Da
Mass Number277
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

277Rg Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

278Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
278.16159 ± 0.000417 Da
Mass Number278
G-Factor
Half Life
8 ± 5 ms
Spin
Quadrupole Moment
Discovery Year2007
Parity

278Rg Decay Modes
Decay ModeIntensity
α (α emission)100%

279Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
279.16288 ± 0.000453 Da
Mass Number279
G-Factor
Half Life
170 ± 110 ms
Spin
Quadrupole Moment
Discovery Year2004
Parity

279Rg Decay Modes
Decay ModeIntensity
α (α emission)100%

280Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
280.165204 ± 0.000571 Da
Mass Number280
G-Factor
Half Life
4.3 ± 0.5 s
Spin
Quadrupole Moment
Discovery Year2004
Parity

280Rg Decay Modes
Decay ModeIntensity
α (α emission)100%

281Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
281.166757 ± 0.000831 Da
Mass Number281
G-Factor
Half Life
19 ± 5 s
Spin
Quadrupole Moment
Discovery Year2010
Parity

281Rg Decay Modes
Decay ModeIntensity
SF (spontaneous fission)87%
α (α emission)13%

282Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
282.169343 ± 0.000631 Da
Mass Number282
G-Factor
Half Life
130 ± 50 s
Spin
Quadrupole Moment
Discovery Year2010
Parity

282Rg Decay Modes
Decay ModeIntensity
α (α emission)100%

283Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
283.171101 ± 0.000728 Da
Mass Number283
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

283Rg Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

284Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
284.173882 ± 0.000537 Da
Mass Number284
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

284Rg Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

285Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
285.175771 ± 0.000644 Da
Mass Number285
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

285Rg Decay Modes
Decay ModeIntensity
α (α emission)%
SF (spontaneous fission)%

286Rg

AbundanceRadioactive ☢️
Relative Atomic Mass
286.178756 ± 0.000492 Da
Mass Number286
G-Factor
Half Life
Spin
Quadrupole Moment
Discovery Year2016
Parity

286Rg Decay Modes
Decay ModeIntensity
α (α emission)100%
SF (spontaneous fission)%

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
Etymology (Name Origin)Named in honor of the physicist Wilhelm Roentgen.
Pronunciationoon-nun-OON-i-em (English)
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.

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