Roentgenium is an extremely radioactive synthetic element. The most stable known isotope, roentgenium-281, has a half-life of 26 seconds and is calculated to have similar properties to its lighter homologues, copper, silver, and gold, although it may show some differences from them.

1994 by Workers at Gesellschaft für Schwerionenforschung, Germany.

DISCOVERY

From the name of Wilhelm Conrad Roentgen, discoverer of X-rays.

ETYMOLOGY

Roentgenium

Element

Rg

Symbol

111

111 Atomic Number

Atomic Number

Transition Metal

Classification

54386-24-2

CAS Number

-

Elemental Colour

-

Refractive Index

-

Poisson Ratio

9.762 cm³

Molar Volume

-

Brinell Hardness

-

Mohs Hardness

-

Vickers Hardness

-

Speed of Sound

-

Bulk Modulus

-

Shear Modulus

-

Young Modulus

Allotropes

NONE

-

Melting Point

-

Boiling Point

-

Automatic Ignition

-

Flashpoint

-

Critical Temperature

-

Critical Pressure

-

Thermal Conductivity

-

Thermal Expansion

-

Specific Heat

-

Heat Fusion

-

Heat Vaporisation

-

Heat Combustion

-

Curie Point

-

Neel Point

-

Adiabatic Index

Solid

Phase

-

Electrical Type

-

Conductivity

-

Resistivity

-

Superconducting Point

-

Magnetic Type

-

Mass Susceptibility

-

Molar Susceptibility

-

Volume Susceptibility

Material Composition

-

Universe

-

Meteorites

-

Sun

-

Earth Crust

-

Oceans

-

Humans

280.165'140'0

Atomic Weight

-

Atomic Radius

121 pm

Covalent Radius Single Bond

116 pm

Covalent Radius Double Bond

118 pm

Covalent Radius Triple Bond

-

Van der Waals Radius

[Rn]7s¹5f¹⁴6d¹⁰

Electron Configuration

Cubic, Body-centred

Crystal Structure

28.700'00 g/cm³

Density as Solid

-

Density as Liquid

-

Density as Gas

-

Space Group Name

-

Space Group Number

-

Lattice Angles

-

Lattice Constants

10.00 minutes

Half Life

14.50 minutes

Lifetime

6d¹⁰ = 6, 2, +1, -1/2

Quantum Numbers

-

Neutron Cross Section

-

Neutron Mass Absorption

Stable Isotopes

NONE

Unstable Isotopes

Isotopes Overview

Isotope	Stability	Symbol	Type	Protons		Neutrons		Spin	Mass		Abundance		Mass Measure	Mass Excess		Binding Energy		Dipole Moment	Quadrupole Moment	Halflife in Years		Halflife in Seconds		A01 Decay Probability		A01 Decay Mode	A01 Decay Energy		A01 Decay Daughter	A01 Decay Link	A02 Decay Mode	A02 Decay Energy		A02 Decay Daughter	A02 Decay Link	Y01 Decay Product Yield		Y01 Decay Product Nuclide	Y02 Decay Product Yield		Y02 Decay Product Nuclide	Y03 Decay Product Yield		Y03 Decay Product Nuclide	Y04 Decay Product Yield		Y04 Decay Product Nuclide	Y05 Decay Product Yield		Y05 Decay Product Nuclide	Y06 Decay Product Yield		Y06 Decay Product Nuclide	Y07 Decay Product Yield		Y07 Decay Product Nuclide	Y08 Decay Product Yield		Y08 Decay Product Nuclide	Y09 Decay Product Yield		Y09 Decay Product Nuclide	Y10 Decay Product Yield		Y10 Decay Product Nuclide	Y11 Decay Product Yield		Y11 Decay Product Nuclide	Y12 Decay Product Yield		Y12 Decay Product Nuclide
Isotope_111_rg_272_u	Unstable	²⁷²Rg	Fermion	111	p	161	n	?	272.153'615'000'0	u	~ 0	%	~ 0	150.959'000'000'0	MeV	7.228'000'000'0	MeV	-	-	6.34E-11	year	2.000	milli-seconds ( x⁻³ )	100.000'000	%	α	?	keV	²⁶⁸Mt	²⁷²Rg > [ 100 % , α , ? keV ] > ²⁶⁸Mt						?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg
Isotope_111_rg_273_u	Unstable	²⁷³Rg	Boson	111	p	162	n	?	273.153'682'000'0	u	~ 0	%	~ 0	143.091'000'000'0	MeV	7.226'000'000'0	MeV	-	-	1.58E-10	year	5.000	milli-seconds ( x⁻³ )	?	%	α	?	keV	²⁶⁹Mt	²⁷³Rg > [ ? % , α , ? keV ] > ²⁶⁹Mt						?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_111_rg_274_u	Unstable	²⁷⁴Rg	Fermion	111	p	163	n	?	274.155'713'000'0	u	~ 0	%	~ 0	143.154'000'000'0	MeV	7.229'000'000'0	MeV	-	-	1.58E-10	year	5.000	milli-seconds ( x⁻³ )	?	%	α	?	keV	²⁷⁰Mt	²⁷⁴Rg > [ ? % , α , ? keV ] > ²⁷⁰Mt						?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_111_rg_275_u	Unstable	²⁷⁵Rg	Boson	111	p	164	n	?	275.156'142'000'0	u	~ 0	%	~ 0	145.046'000'000'0	MeV	7.225'000'000'0	MeV	-	-	3.17E-10	year	10.000	milli-seconds ( x⁻³ )	?	%	α	?	keV	²⁷¹Mt	²⁷⁵Rg > [ ? % , α , ? keV ] > ²⁷¹Mt						?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_111_rg_276_u	Unstable	²⁷⁶Rg	Fermion	111	p	165	n	?	276.158'493'000'0	u	~ 0	%	~ 0	145.445'000'000'0	MeV	7.227'000'000'0	MeV	-	-	3.17E-9	year	100.000	milli-seconds ( x⁻³ )	?	%	α	?	keV	²⁷²Mt	²⁷⁶Rg > [ ? % , α , ? keV ] > ²⁷²Mt	SF	?	keV	V	²⁷⁶Rg > [ , SF , ? keV ] > V	?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_111_rg_277_u	Unstable	²⁷⁷Rg	Boson	111	p	166	n	?	277.159'519'000'0	u	~ 0	%	~ 0	147.636'000'000'0	MeV	7.222'000'000'0	MeV	-	-	3.17E-8	year	1,000.000	milliseconds ( x⁻³ )	?	%	α	?	keV	²⁷³Mt	²⁷⁷Rg > [ ? % , α , ? keV ] > ²⁷³Mt	SF	?	keV	V	²⁷⁷Rg > [ , SF , ? keV ] > V	?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_111_rg_278_u	Unstable	²⁷⁸Rg	Fermion	111	p	167	n	?	278.161'604'000'0	u	~ 0	%	~ 0	148.591'000'000'0	MeV	7.221'000'000'0	MeV	-	-	3.17E-8	year	1,000.000	milliseconds ( x⁻³ )	?	%	α	?	keV	²⁷⁴Mt	²⁷⁸Rg > [ ? % , α , ? keV ] > ²⁷⁴Mt	SF	?	keV	V	²⁷⁸Rg > [ , SF , ? keV ] > V	?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_111_rg_279_u	Unstable	²⁷⁹Rg	Boson	111	p	168	n	?	279.162'468'000'0	u	~ 0	%	~ 0	150.533'000'000'0	MeV	7.217'000'000'0	MeV	-	-	9.51E-8	year	3.000	seconds ( x⁰ )	?	%	α	?	keV	²⁷⁵Mt	²⁷⁹Rg > [ ? % , α , ? keV ] > ²⁷⁵Mt	SF	?	keV	V	²⁷⁹Rg > [ , SF , ? keV ] > V	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb	?	%	²⁰⁷Pb	?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy
Isotope_111_rg_280_u	Unstable	²⁸⁰Rg	Fermion	111	p	169	n	?	280.164'473'000'0	u	~ 0	%	~ 0	151.338'000'000'0	MeV	7.218'000'000'0	MeV	-	-	3.17E-7	year	10.000	seconds ( x⁰ )	?	%	α	?	keV	²⁷⁶Mt	²⁸⁰Rg > [ ? % , α , ? keV ] > ²⁷⁶Mt	SF	?	keV	V	²⁸⁰Rg > [ , SF , ? keV ] > V	?	%	²⁰⁸Pb	?	%	²⁰⁶Pb	?	%	²⁰⁰Hg	?	%	²⁰⁶Pb
Isotope_111_rg_281_u	Unstable	²⁸¹Rg	Boson	111	p	170	n	?	281.165'372'000'0	u	~ 0	%	~ 0	153.206'000'000'0	MeV	7.214'000'000'0	MeV	-	-	1.90E-6	year	60.000	seconds ( x⁰ )	?	%	α	?	keV	²⁷⁷Mt	²⁸¹Rg > [ ? % , α , ? keV ] > ²⁷⁷Mt	SF	?	keV	V	²⁸¹Rg > [ , SF , ? keV ] > V	?	%	²⁰⁵Tl	?	%	²⁰⁷Pb
Isotope_111_rg_282_u	Unstable	²⁸²Rg	Fermion	111	p	171	n	?	282.167'486'000'0	u	~ 0	%	~ 0	154.043'000'000'0	MeV	7.214'000'000'0	MeV	-	-	6.33E-6	year	199.800	seconds ( x⁰ )	?	%	α	?	keV	²⁷⁸Mt	²⁸²Rg > [ ? % , α , ? keV ] > ²⁷⁸Mt	SF	?	keV	V	²⁸²Rg > [ , SF , ? keV ] > V	?	%	¹⁷²Yb	?	%	²⁰⁵Tl	?	%	²⁰⁸Pb
Isotope_111_rg_283_u	Unstable	²⁸³Rg	Boson	111	p	172	n	?	283.168'415'000'0	u	~ 0	%	~ 0	156.012'000'000'0	MeV	7.210'000'000'0	MeV	-	-	1.90E-5	year	600.000	seconds ( x⁰ )	?	%	α	?	keV	²⁷⁹Mt	²⁸³Rg > [ ? % , α , ? keV ] > ²⁷⁹Mt	SF	?	keV	V	²⁸³Rg > [ , SF , ? keV ] > V										?	%	²⁰⁶Pb	?	%	¹⁷⁶Hf	?	%	¹⁶⁰Dy	?	%	¹⁴⁰Ce	?	%	¹⁵²Sm	?	%	¹⁸⁰Hf	?	%	¹⁵⁶Gd	?	%	¹⁶⁸Er	?	%	¹⁶⁴Dy

111 – Roentgenium, Rg

111 – Roentgenium, Rg

111 – Roentgenium, Rg

111 – Roentgenium, Rg

111 – Roentgenium, Rg

Spectrograph

Elemental Tile

Roentgenium

Spectrograph

Elemental Tile

Roentgenium

Spectrograph

Elemental Tile

Roentgenium

Spectrograph

Elemental Tile

Roentgenium

Spectrograph

Elemental Tile

Roentgenium