Roentgeni (Rg)

chemical element with atomic number 111

Atomic Number	111
Atomic Weight	281
Rhif màs	272

Group	11
Period	7
Block	d

Proton	111 p⁺
Niwtron	161 n⁰
Electron	111 e^-

Nodwedd Ffisegol

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

Nodwedd Gemegol

egni

proton affinity
electron affinity
ionization energy
enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
Electron

plisgyn yr electron	2, 8, 18, 32, 32, 17, 2

valence electron	1 ⓘ

trefn yr electronnau	[Rn] 5f¹⁴ 6d¹⁰ 7s¹ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹⁴ 6d¹⁰ 7s¹

Cyflwr ocsidiad
Electronegatifedd
Electrophilicity Index
cyflwr sylfaenol mater

cyflwr mater	Solid
gaseous state of matter
Boiling Point
Melting Point
critical pressure
critical temperature
triple point
appearance
lliw	Colorless
appearance
Mynegrif plygiant
nodwedd ffisegol gwrthrych
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
dargludedd trydanol
Gwrthedd
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
strwythur
Crystal Structure	()
lattice constant
Lattice Angles
nodwedd mecanyddol deunyddiau
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
Category	Transition metals, Transition metals
CAS Group	IB
IUPAC Group	IB
Glawe Number
Mendeleev Number	74
Pettifor Number
Geochemical Class
Goldschmidt classification	synthetic

other

Gas Basicity
polarizability	32 ± 6 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
Neutron Mass Absorption
quantum number	2S1/2
space group	()

Isotopes of Roentgenium

Stable Isotopes	0
Unstable Isotopes	15
Natural Isotopes	0

²⁷²Rg

Rhif màs	272
neutron number	161
Relative Atomic Mass	272.153273 ± 0.000251 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	4.2 ± 1.1 ms
spin
nuclear quadrupole moment
dyddiad darganfod	1995
parity

decay mode	intensity
α (α emission)	100%

²⁷³Rg

Rhif màs	273
neutron number	162
Relative Atomic Mass	273.153393 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay mode	intensity
α (α emission)

²⁷⁴Rg

Rhif màs	274
neutron number	163
Relative Atomic Mass	274.155247 ± 0.000225 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	20 ± 11 ms
spin
nuclear quadrupole moment
dyddiad darganfod	2004
parity

decay mode	intensity
α (α emission)	100%

²⁷⁵Rg

Rhif màs	275
neutron number	164
Relative Atomic Mass	275.156088 ± 0.000479 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay mode	intensity
α (α emission)

²⁷⁶Rg

Rhif màs	276
neutron number	165
Relative Atomic Mass	276.158226 ± 0.000675 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay mode	intensity
α (α emission)
SF (spontaneous fission)

²⁷⁷Rg

Rhif màs	277
neutron number	166
Relative Atomic Mass	277.159322 ± 0.000504 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay mode	intensity
α (α emission)
SF (spontaneous fission)

²⁷⁸Rg

Rhif màs	278
neutron number	167
Relative Atomic Mass	278.16159 ± 0.000417 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	8 ± 5 ms
spin
nuclear quadrupole moment
dyddiad darganfod	2007
parity

decay mode	intensity
α (α emission)	100%

²⁷⁹Rg

Rhif màs	279
neutron number	168
Relative Atomic Mass	279.16288 ± 0.000453 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	170 ± 110 ms
spin
nuclear quadrupole moment
dyddiad darganfod	2004
parity

decay mode	intensity
α (α emission)	100%

²⁸⁰Rg

Rhif màs	280
neutron number	169
Relative Atomic Mass	280.165204 ± 0.000571 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	4.3 ± 0.5 s
spin
nuclear quadrupole moment
dyddiad darganfod	2004
parity

decay mode	intensity
α (α emission)	100%

²⁸¹Rg

Rhif màs	281
neutron number	170
Relative Atomic Mass	281.166757 ± 0.000831 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	19 ± 5 s
spin
nuclear quadrupole moment
dyddiad darganfod	2010
parity

decay mode	intensity
SF (spontaneous fission)	87%
α (α emission)	13%

²⁸²Rg

Rhif màs	282
neutron number	171
Relative Atomic Mass	282.169343 ± 0.000631 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	130 ± 50 s
spin
nuclear quadrupole moment
dyddiad darganfod	2010
parity

decay mode	intensity
α (α emission)	100%

²⁸³Rg

Rhif màs	283
neutron number	172
Relative Atomic Mass	283.171101 ± 0.000728 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay mode	intensity
α (α emission)
SF (spontaneous fission)

²⁸⁴Rg

Rhif màs	284
neutron number	173
Relative Atomic Mass	284.173882 ± 0.000537 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay mode	intensity
α (α emission)
SF (spontaneous fission)

²⁸⁵Rg

Rhif màs	285
neutron number	174
Relative Atomic Mass	285.175771 ± 0.000644 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod
parity

decay mode	intensity
α (α emission)
SF (spontaneous fission)

²⁸⁶Rg

Rhif màs	286
neutron number	175
Relative Atomic Mass	286.178756 ± 0.000492 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod	2016
parity

decay mode	intensity
α (α emission)	100%
SF (spontaneous fission)

hanes

darganfyddwr neu ddyfeisiwr	Heavy Ion Research Laboratory (HIRL)
man darganfod	Germany
dyddiad darganfod	1994
geirdarddiad	Named in honor of the physicist Wilhelm Roentgen.
ynganiad	oon-nun-OON-i-em (Saesneg)

source

Abundance
Abundance in Earth's crust
natural abundance (cefnfor)
natural abundance (corff dynol)	0 %
natural abundance (Awyrfaen)	0 %
natural abundance (Haul)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Roentgeni on ChemicalAid

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

Roentgeni (Rg)

Nodwedd Ffisegol

Nodwedd Gemegol

other

Isotopes of Roentgenium

272Rg

273Rg

274Rg

275Rg

276Rg

277Rg

278Rg

279Rg

280Rg

281Rg

282Rg

283Rg

284Rg

285Rg

286Rg

hanes

source

Nuclear Screening Constants

²⁷²Rg

²⁷³Rg

²⁷⁴Rg

²⁷⁵Rg

²⁷⁶Rg

²⁷⁷Rg

²⁷⁸Rg

²⁷⁹Rg

²⁸⁰Rg

²⁸¹Rg

²⁸²Rg

²⁸³Rg

²⁸⁴Rg

²⁸⁵Rg

²⁸⁶Rg