Roentgenium (Rg)

Roentgenium is the 111th element in the periodic table and has a symbol of Rg and atomic number of 111. It has an atomic weight of (281) and a mass number of 272. Roentgenium has one hundred eleven protons and one hundred sixty-one neutrons in its nucleus, and one hundred eleven electrons in seven shells. It is located in group eleven, period seven and block d of the periodic table.

Atomic Number	111
Atomic Weight	281
Mass Number	272

Group	11
Period	7
Block	d

Protons	111 p⁺
Neutrons	161 n⁰
Electrons	111 e^-

Physical Properties

Atomic Radius
Molar Volume
Covalent Radius	121 pm 116 pm 118 pm
Metallic Radius
Ionic Radius
Crystal Radius
Van der Waals Radius
Density	28.7 g/cm³

Chemical Properties

Energy

Proton Affinity
Electron Affinity
Ionization Energy
Heat of Vaporization
Heat of Fusion
Heat of Formation
Electrons

Electron Shells	2, 8, 18, 32, 32, 17, 2

Valence Electrons	1 ⓘ

Electron Configuration	[Rn] 5f¹⁴ 6d¹⁰ 7s¹ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹⁴ 6d¹⁰ 7s¹

Oxidation States
Electronegativity
Electrophilicity Index
States of Matter

Phase	Solid
Gas Phase
Boiling Point
Melting Point
Critical Pressure
Critical Temperature
Triple Point
Visual
Roentgenium is a Colorless.
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
The lattice angles of Roentgenium is .
Crystal Structure	()
Lattice Constant
Lattice Angles
Mechanical Properties

Hardness
Bulk Modulus
Shear Modulus
Young's Modulus
Poisson Ratio
Speed of Sound
Classification
The CAS Group of Roentgenium is IB. The IUPAC Group of Rg is IB. The Mendeleev Number of Element 111 is 74. The Goldschmidt Class of Roentgenium (Rg) is synthetic.
Category	Transition metals, Transition metals
CAS Group	IB
IUPAC Group	IB
Glawe Number
Mendeleev Number	74
Pettifor Number
Geochemical Class
Goldschmidt Class	synthetic

Other

The Dipole Polarizability of Roentgenium is 32 plus or minus 6 a₀. The Allotropes of Rg is . The Quantum Numbers of Element 111 is 2S1/2. The Space Group of Roentgenium (Rg) is ().

Gas Basicity
Dipole Polarizability	32 ± 6 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers	2S1/2
Space Group	()

Isotopes of Roentgenium

Stable Isotopes	0
Unstable Isotopes	15
Natural Isotopes	0

²⁷²Rg

Mass Number	272
Neutron Number	161
Relative Atomic Mass	272.153273 ± 0.000251 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	4.2 ± 1.1 ms
Spin
Quadrupole Moment
Discovery Year	1995
Parity

Decay Mode	Intensity
α (α emission)	100%

²⁷³Rg

Mass Number	273
Neutron Number	162
Relative Atomic Mass	273.153393 ± 0.000429 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)

²⁷⁴Rg

Mass Number	274
Neutron Number	163
Relative Atomic Mass	274.155247 ± 0.000225 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	20 ± 11 ms
Spin
Quadrupole Moment
Discovery Year	2004
Parity

Decay Mode	Intensity
α (α emission)	100%

²⁷⁵Rg

Mass Number	275
Neutron Number	164
Relative Atomic Mass	275.156088 ± 0.000479 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)

²⁷⁶Rg

Mass Number	276
Neutron Number	165
Relative Atomic Mass	276.158226 ± 0.000675 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)
SF (spontaneous fission)

²⁷⁷Rg

Mass Number	277
Neutron Number	166
Relative Atomic Mass	277.159322 ± 0.000504 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)
SF (spontaneous fission)

²⁷⁸Rg

Mass Number	278
Neutron Number	167
Relative Atomic Mass	278.16159 ± 0.000417 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	8 ± 5 ms
Spin
Quadrupole Moment
Discovery Year	2007
Parity

Decay Mode	Intensity
α (α emission)	100%

²⁷⁹Rg

Mass Number	279
Neutron Number	168
Relative Atomic Mass	279.16288 ± 0.000453 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	170 ± 110 ms
Spin
Quadrupole Moment
Discovery Year	2004
Parity

Decay Mode	Intensity
α (α emission)	100%

²⁸⁰Rg

Mass Number	280
Neutron Number	169
Relative Atomic Mass	280.165204 ± 0.000571 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	4.3 ± 0.5 s
Spin
Quadrupole Moment
Discovery Year	2004
Parity

Decay Mode	Intensity
α (α emission)	100%

²⁸¹Rg

Mass Number	281
Neutron Number	170
Relative Atomic Mass	281.166757 ± 0.000831 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	19 ± 5 s
Spin
Quadrupole Moment
Discovery Year	2010
Parity

Decay Mode	Intensity
SF (spontaneous fission)	87%
α (α emission)	13%

²⁸²Rg

Mass Number	282
Neutron Number	171
Relative Atomic Mass	282.169343 ± 0.000631 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	130 ± 50 s
Spin
Quadrupole Moment
Discovery Year	2010
Parity

Decay Mode	Intensity
α (α emission)	100%

²⁸³Rg

Mass Number	283
Neutron Number	172
Relative Atomic Mass	283.171101 ± 0.000728 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)
SF (spontaneous fission)

²⁸⁴Rg

Mass Number	284
Neutron Number	173
Relative Atomic Mass	284.173882 ± 0.000537 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)
SF (spontaneous fission)

²⁸⁵Rg

Mass Number	285
Neutron Number	174
Relative Atomic Mass	285.175771 ± 0.000644 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay Mode	Intensity
α (α emission)
SF (spontaneous fission)

²⁸⁶Rg

Mass Number	286
Neutron Number	175
Relative Atomic Mass	286.178756 ± 0.000492 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year	2016
Parity

Decay Mode	Intensity
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

Discoverers	Heavy Ion Research Laboratory (HIRL)
Discovery Location	Germany
Discovery Year	1994
Etymology (Name Origin)	Named in honor of the physicist Wilhelm Roentgen.
Pronunciation	oon-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
Natural Abundance (Oceans)
Natural Abundance (Human Body)	0 %
Natural Abundance (Meteor)	0 %
Natural Abundance (Sun)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Also Known As

Rg
element 111
Uuu
unununium
ununnilium

Translations

Norwegian Bokmålrøntgenium
Frenchroentgenium
Norwegian Nynorskrøntgenium
Danishrøntgenium
Swedishröntgenium
Finnishröntgenium
Hungarianröntgenium
Portugueseroentgénio
Spanishroentgenio
Italianroentgenio
GermanRöntgenium
Amharicሮየንቴኒየም
AragoneseRoentguenio
Arabicرونتجينيوم
AzerbaijaniRentgenium
BelarusianРэнтгеній
Banglaরন্টজেনিয়াম
BosnianRentgenij
Catalanroentgeni
CorsicanRoentgeniu
Czechroentgenium
ChuvashРентгени
WelshRoentgeniwm
Greekρεντγκένιο
Esperantorentgenio
EstonianRöntgeenium
Basqueroentgenio
Persianرونتگنیم
Northern FrisianRoentgenium
FriulianRoentgjeni
GalicianRoentgenio
GuaraniRoenthenio
ManxRoentgenium
Hakka Chineseroentgenium
Hebrewרנטגניום
Fiji HindiRoentgenium
CroatianRoentgenij
InterlinguaRoentgenium
Indonesianroentgenium
Icelandicröntgenín
Japaneseレントゲニウム
JavaneseRoentgenium
Kannadaರೆಂಟ್ಜೇನಿಯಮ್
Korean뢴트게늄
KurdishÛnûnûnyûm
KomiРӧнтгений
Latinroentgenium
LuxembourgishRoentgenium
LigurianRœntgenio
LithuanianRentgenis
Latvianrentgenijs
Malayalamറോണ്ട്ഗെനിയം
Western MariРентгений
MalayRoentgenium
Low GermanRoentgenium
Dutchröntgenium
Polishroentgen
QuechuaRoentgenyu
Romanianroentgeniu
Russianрентгений
Sicilianruintgheniu
Serbo-CroatianRentgenijum
Slovakröntgénium
Serbianрентгенијум
Saterland FrisianRoentgenium
SwahiliRoentgeni
Thaiเรินต์เกเนียม
TurkishRöntgenyum
Uyghurرۆنتگېنىي
Ukrainianрентгеній
Urduروٹجینیم
VepsRöntgenii
VietnameseRoentgeni
WarayRoentgenyo
KalmykРентгениум
YorubaRoentgenium
Chinese錀
Macedonianрендгениум
CebuanoRoentgenyo
BretonRoentgeniom
Central Kurdishڕۆنتگێنیۆم
Odiaରୋଏଣ୍ଟ୍‌ଜେନିଅମ
Gujaratiરેન્ટજિનીયમ
OccitanRoentgèni
TatarРентгений
Bulgarianрьонтгений
Western Panjabiرونٹجینیم
Tamilஇரோயன்ட்கெனியம்
SomaliRoentgeniyaam
KazakhРентгений
Chinese (Hong Kong SAR China)錀
Chinese (China)𬬭
Cantonese錀
Newariरोएन्तजेनियम
AlbanianRoentgeniumi
Belarusian (Taraskievica orthography)Рэнтген
Chinese (Simplified)𬬭
Chinese (Taiwan)錀
Chinese (Traditional)錀
AromanianRoentgeniu
Armenianռենտգենիում
Nepaliरेन्टगेनियम
Malteseroentgenju
Hindiरेन्टजेनियम
SlovenianRentgenij
Portuguese (Brazil)roentgênio
Scottish GaelicRoentgenium
Sanskritउनउनउनियम
Bhojpuriरंटगेनियम
Teluguరోయెంట్‌జీనియం
cdoRoentgenium
Min Nan ChineseRoentgenium
Marathiरेन्ट्जेनियम
Paliउनउनउनियम
LimburgishRoentgenium
UzbekRentgeniy
Asturianroentxeniu
English (United Kingdom)roentgenium
Literary Chinese錀
TagalogRoentgenyo
kbpRʊwɛntɩgɛnɩyɔm
AfrikaansRöntgenium
Lingua Franca Novarontgenio
Volapükröntgenin
TajikРентгений
IrishRointginiam
Mongolianрентгени
Wu Chinese𬬭
SardinianRoentgèniu
Burmeseရွန့်ဂန္နီယမ်
Chinese (Singapore)𬬭
Chinese (Malaysia)𬬭
Chinese (Macao SAR China)錀
BashkirРентгений
Egyptian Arabicرونتجينيوم
Pashtoرونټگېنيوم
CornishRoentgeniom
BalineseRoéntgénium
IdoRentgenio
Georgianრენტგენიუმი

Roentgenium on ChemicalAid

Australian Educational Vocabulary ID	scot/9704
CAS Registry Number	54386-24-2
Elhuyar ZTH ID	133475
Encyclopædia Britannica Online ID	science/roentgenium
Freebase ID	/m/025tpyw
GND ID	7635623-1
Gran Enciclopèdia Catalana ID	0282399
Great Russian Encyclopedia Online ID	3505864
KBpedia ID	Roentgenium
Library of Congress authority ID	sh2012003700
NE.se ID	röntgenium
NE.se ID	unununium
National Library of Israel J9U ID	987007595444605171
OmegaWiki Defined Meaning	350608
Online PWN Encyclopedia ID	4005803
Store norske leksikon ID	røntgenium
USGS Thesaurus ID	1602
WordNet 3.1 Synset ID	14677003-n

Roentgenium (Rg)

Physical Properties

Chemical Properties

Other

Isotopes of Roentgenium

272Rg

273Rg

274Rg

275Rg

276Rg

277Rg

278Rg

279Rg

280Rg

281Rg

282Rg

283Rg

284Rg

285Rg

286Rg