Radi (Ra)

chemical element with the atomic number of 88

Atomic Number	88
Atomic Weight	226
mass number	201

Group	2
Period	7
Block	s

proton	88 p⁺
neutron	113 n⁰
electron	88 e^-

Proprietat Fisica

Rai Atomic	215 pm 292 pm
molar volume	45 cm³/mol
covalent radius	201 pm 173 pm 159 pm 221 pm
Metallic Radius
ionic radius	148 pm 170 pm
Crystal Radius	162 pm 184 pm
Rai de van der Waals	283 pm 327 pm 283 pm 367.7 pm
densitat	5 g/cm³

Chemical Property

energia

proton affinity
electron affinity	0.1 eV/particle
ionization energy	5.278424 eV/particle 10.147153 eV/particle 31 eV/particle 41 eV/particle 52.9 eV/particle 64 eV/particle 82 eV/particle 97 eV/particle 100 eV/particle 140 eV/particle 204.9 eV/particle 227 eV/particle 250 eV/particle 274 eV/particle 299 eV/particle 324 eV/particle 356 eV/particle 382 eV/particle 409 eV/particle 435 eV/particle 570 eV/particle 600 eV/particle 630 eV/particle 660 eV/particle 740 eV/particle 770 eV/particle 860 eV/particle 900 eV/particle 970 eV/particle 1040 eV/particle 1110 eV/particle 1180 eV/particle 1250 eV/particle 1320 eV/particle 1390 eV/particle 1460 eV/particle 1530 eV/particle 1610 eV/particle 1680 eV/particle 1750 eV/particle 1820 eV/particle 1880 eV/particle 2208 eV/particle 2271 eV/particle 2338 eV/particle 2409 eV/particle 2477 eV/particle 2544 eV/particle 2662 eV/particle 2731 eV/particle 2806 eV/particle 2876 eV/particle 3155 eV/particle 3224 eV/particle 3300 eV/particle 3368 eV/particle 3682 eV/particle 3762 eV/particle 3959 eV/particle 4040 eV/particle 6565 eV/particle 6718 eV/particle 6881 eV/particle 7056 eV/particle 7222 eV/particle 7380 eV/particle 7720 eV/particle 7890 eV/particle 8080 eV/particle 8250 eV/particle 8730 eV/particle 8880 eV/particle 9040 eV/particle 9200 eV/particle 10190 eV/particle 10360 eV/particle 10720 eV/particle 10890 eV/particle 22900 eV/particle 23300 eV/particle 23750 eV/particle 24160 eV/particle 27830 eV/particle 28370 eV/particle 29050 eV/particle 29479.8 eV/particle 116848.7 eV/particle 118931.3 eV/particle

enthalpy of vaporization	113 kJ/mol
enthalpy of fusion	9.6 kJ/mol
standard enthalpy of formation	159 kJ/mol
electron

electron shell	2, 8, 18, 32, 18, 8, 2

valence electron	2 ⓘ

electron configuration	[Rn] 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s²

oxidation number	2
Electronegativitat	0.09789 0.9
Electrophilicity Index	0.6982685447294388 eV/particle
fundamental state of matter

estat de la matèria	Solid
gaseous state of matter
Boiling Point
Melting Point	969.15 K
critical pressure
critical temperature
Ponch triple
appearance
Color	Silver #ffffff #007d00 #007d00
appearance	silvery white metallic
Indici de refraccion
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	1 MS/m
electrical resistivity	0.000001 Ω*m
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
estructura
Crystal Structure	Body Centered Cubic ()
lattice constant
Lattice Angles	π/2, π/2, π/2
mechanical property
Duretat
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
Category	Alkaline earth metals, Alkaline earth metals
CAS Group	IIA
IUPAC Group	IIA
Glawe Number	13
Mendeleev Number	10
Pettifor Number	13
Geochemical Class	U/Th decay series
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	246 ± 4 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	13
Neutron Mass Absorption
quantum number	1S0
space group	229 (Im_3m)

Isotopes of Radium

Stable Isotopes	0
Unstable Isotopes	35
Natural Isotopes	0

²⁰¹Ra

mass number	201
neutron number	113
Relative Atomic Mass	201.012814699 ± 0.000021794 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	20 ± 30 ms
Espin	3/2
nuclear quadrupole moment
data de descobèrta	2005
parity	-

decay mode	intensity
α (α emission)	100%

²⁰²Ra

mass number	202
neutron number	114
Relative Atomic Mass	202.009742305 ± 0.000016122 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	4.1 ± 1.1 ms
Espin	0
nuclear quadrupole moment	0
data de descobèrta	2005
parity	+

decay mode	intensity
α (α emission)	100%

²⁰³Ra

mass number	203
neutron number	115
Relative Atomic Mass	203.009233907 ± 0.0000104 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	36 ± 13 ms
Espin	3/2
nuclear quadrupole moment
data de descobèrta	1996
parity	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁰⁴Ra

mass number	204
neutron number	116
Relative Atomic Mass	204.006506855 ± 0.00000958 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	60 ± 9 ms
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1995
parity	+

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁰⁵Ra

mass number	205
neutron number	117
Relative Atomic Mass	205.006230692 ± 0.000024446 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	220 ± 50 ms
Espin	3/2
nuclear quadrupole moment
data de descobèrta	1987
parity	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁰⁶Ra

mass number	206
neutron number	118
Relative Atomic Mass	206.003827842 ± 0.000019332 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	240 ± 20 ms
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1967
parity	+

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁰⁷Ra

mass number	207
neutron number	119
Relative Atomic Mass	207.00377242 ± 0.000062572 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	1.38 ± 0.18 s
Espin	5/2
nuclear quadrupole moment
data de descobèrta	1967
parity	-

decay mode	intensity
α (α emission)	86%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁰⁸Ra

mass number	208
neutron number	120
Relative Atomic Mass	208.001855012 ± 0.000009686 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	1.11 ± 0.045 s
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1967
parity	+

decay mode	intensity
α (α emission)	87%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁰⁹Ra

mass number	209
neutron number	121
Relative Atomic Mass	209.001994902 ± 0.000006169 Da
g-factor	0.3444 ± 0.0052
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	4.71 ± 0.08 s
Espin	5/2
nuclear quadrupole moment	0.39 ± 0.04
data de descobèrta	1967
parity	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²¹⁰Ra

mass number	210
neutron number	122
Relative Atomic Mass	210.000475406 ± 0.000009868 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	4 ± 0.1 s
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1967
parity	+

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²¹¹Ra

mass number	211
neutron number	123
Relative Atomic Mass	211.000893049 ± 0.000005331 Da
g-factor	0.3496 ± 0.0016
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	12.6 ± 1.2 s
Espin	5/2
nuclear quadrupole moment	0.46 ± 0.04
data de descobèrta	1967
parity	-

decay mode	intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²¹²Ra

mass number	212
neutron number	124
Relative Atomic Mass	211.999786619 ± 0.000011007 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	13 ± 0.2 s
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1967
parity	+

decay mode	intensity
α (α emission)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²¹³Ra

mass number	213
neutron number	125
Relative Atomic Mass	213.000370971 ± 0.00001054 Da
g-factor	1.22 ± 0.004
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	2.73 ± 0.05 m
Espin	1/2
nuclear quadrupole moment	0
data de descobèrta	1955
parity	-

decay mode	intensity
α (α emission)	87%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	13%

²¹⁴Ra

mass number	214
neutron number	126
Relative Atomic Mass	214.00009956 ± 0.000005636 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	2.437 ± 0.016 s
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1967
parity	+

decay mode	intensity
α (α emission)	99.941%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	0.059%

²¹⁵Ra

mass number	215
neutron number	127
Relative Atomic Mass	215.002718208 ± 0.00000773 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	1.669 ± 0.009 ms
Espin	9/2
nuclear quadrupole moment
data de descobèrta	1967
parity	+

decay mode	intensity
α (α emission)	100%

²¹⁶Ra

mass number	216
neutron number	128
Relative Atomic Mass	216.003533534 ± 0.000008592 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	172 ± 7 ns
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1972
parity	+

decay mode	intensity
α (α emission)	100%
ϵ (electron capture)	1%

²¹⁷Ra

mass number	217
neutron number	129
Relative Atomic Mass	217.006322676 ± 0.000007564 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	1.95 ± 0.12 us
Espin	9/2
nuclear quadrupole moment
data de descobèrta	1970
parity	+

decay mode	intensity
α (α emission)	100%

²¹⁸Ra

mass number	218
neutron number	130
Relative Atomic Mass	218.007134297 ± 0.000010528 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	25.91 ± 0.14 us
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1970
parity	+

decay mode	intensity
α (α emission)	100%

²¹⁹Ra

mass number	219
neutron number	131
Relative Atomic Mass	219.010084715 ± 0.000007315 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	9 ± 2 ms
Espin	7/2
nuclear quadrupole moment
data de descobèrta	1952
parity

decay mode	intensity
α (α emission)	100%

²²⁰Ra

mass number	220
neutron number	132
Relative Atomic Mass	220.011027542 ± 0.000008153 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	18.1 ± 1.2 ms
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1949
parity	+

decay mode	intensity
α (α emission)	100%

²²¹Ra

mass number	221
neutron number	133
Relative Atomic Mass	221.013917293 ± 0.00000497 Da
g-factor	-0.0716 ± 0.00068
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	25 ± 4 s
Espin	5/2
nuclear quadrupole moment	1.92 ± 0.06
data de descobèrta	1949
parity	+

decay mode	intensity
α (α emission)	100%
14C	1.2%

²²²Ra

mass number	222
neutron number	134
Relative Atomic Mass	222.015373371 ± 0.000004781 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	33.6 ± 0.4 s
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1948
parity	+

decay mode	intensity
α (α emission)	100%
14C	3%

²²³Ra

mass number	223
neutron number	135
Relative Atomic Mass	223.018500648 ± 0.000002243 Da
g-factor	0.17946666666667 ± 0.00053333333333333
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	11.4352 ± 0.001 d
Espin	3/2
nuclear quadrupole moment	1.22 ± 0.03
data de descobèrta	1905
parity	+

decay mode	intensity
α (α emission)	100%
14C	8.9%

²²⁴Ra

mass number	224
neutron number	136
Relative Atomic Mass	224.020210361 ± 0.000001944 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	3.6316 ± 0.0014 d
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1902
parity	+

decay mode	intensity
α (α emission)	100%
14C	4%

²²⁵Ra

mass number	225
neutron number	137
Relative Atomic Mass	225.023610502 ± 0.000002786 Da
g-factor	-1.46 ± 0.004
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	14.82 ± 0.19 d
Espin	1/2
nuclear quadrupole moment	0
data de descobèrta	1947
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²²⁶Ra

mass number	226
neutron number	138
Relative Atomic Mass	226.025408186 ± 0.000002068 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	1.6 ± 0.007 ky
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1898
parity	+

decay mode	intensity
α (α emission)	100%
14C	2.6%
2β⁻ (double β⁻ decay)

²²⁷Ra

mass number	227
neutron number	139
Relative Atomic Mass	227.029176205 ± 0.000002089 Da
g-factor	-0.26733333333333 ± 0.00073333333333333
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	42.2 ± 0.5 m
Espin	3/2
nuclear quadrupole moment	1.53 ± 0.06
data de descobèrta	1953
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²²⁸Ra

mass number	228
neutron number	140
Relative Atomic Mass	228.031068574 ± 0.000002141 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	5.75 ± 0.03 y
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1907
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²²⁹Ra

mass number	229
neutron number	141
Relative Atomic Mass	229.034956703 ± 0.000016576 Da
g-factor	0.19968 ± 0.00056
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	4 ± 0.2 m
Espin	5/2
nuclear quadrupole moment	2.99 ± 0.12
data de descobèrta	1975
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³⁰Ra

mass number	230
neutron number	142
Relative Atomic Mass	230.037054776 ± 0.000011053 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	93 ± 2 m
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1978
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³¹Ra

mass number	231
neutron number	143
Relative Atomic Mass	231.041027085 ± 0.000012206 Da
g-factor	-0.14216 ± 0.00044
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	104 ± 1 s
Espin	5/2
nuclear quadrupole moment
data de descobèrta	1983
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³²Ra

mass number	232
neutron number	144
Relative Atomic Mass	232.043475267 ± 0.000009823 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	4 ± 0.3 m
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1983
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³³Ra

mass number	233
neutron number	145
Relative Atomic Mass	233.04759457 ± 0.000009235 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	30 ± 5 s
Espin	1/2
nuclear quadrupole moment	0
data de descobèrta	1990
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

²³⁴Ra

mass number	234
neutron number	146
Relative Atomic Mass	234.0503821 ± 0.000009 Da
g-factor	0
natural abundance
Radioactivitat	☢️ radioactive element
Semivida	30 ± 10 s
Espin	0
nuclear quadrupole moment	0
data de descobèrta	1990
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ SF (β⁻-delayed fission)

²³⁵Ra

mass number	235
neutron number	147
Relative Atomic Mass	235.05489 ± 0.000322 Da
g-factor
natural abundance
Radioactivitat	☢️ radioactive element
Semivida
Espin	5/2
nuclear quadrupole moment
data de descobèrta
parity	+

decay mode	intensity
β⁻ (β⁻ decay)

istòria

descobridor o inventaire	Pierre and Marie Curie
luòc de descobèrta	France
data de descobèrta	1898
Etimologia	Latin: radius (ray).
pronunciation	RAY-di-em (English)

source

Abundance
Abundance in Earth's crust	0.0000009 mg/kg
natural abundance (Ocean)	0.000000000089 mg/L
natural abundance (còs uman)	0.0000000000001 %
natural abundance (meteoroid)
natural abundance (Solelh)
Abundance in Universe	0 %

Nuclear Screening Constants

Radi on ChemicalAid

AEDA subject keyword ID	17547
Australian Educational Vocabulary ID	scot/3564
Brockhaus Enzyklopädie online ID	radium
CAB ID	18810
DSSTOX compound identifier	DTXCID70875702
Den Store Danske ID	radium
Encyclopædia Universalis ID	radium
French Vikidia ID	Radium
Golden ID	Radium-ZX5K8
Great Russian Encyclopedia Online ID	3489135
InChI	InChI=1S/Ra
InChIKey	HCWPIIXVSYCSAN-UHFFFAOYSA-N
KBpedia ID	Radium
Krugosvet article	nauka_i_tehnika/himiya/RADI.html
Namuwiki ID	라듐
National Library of Israel J9U ID	987007560614605171
Online PWN Encyclopedia ID	3965238
OpenAlex ID	C550196577
RxNorm CUI	1546450
Spanish Vikidia ID	Radio_(elemento_químico)
Store medisinske leksikon ID	radium
Store norske leksikon ID	radium
The Encyclopedia of Science Fiction ID	radium
UK Archival Thesaurus ID	f2/mt225/4347/5017
UNESCO Thesaurus ID	concept14022
USGS Thesaurus ID	1551
WordNet 3.1 Synset ID	14676100-n
YSO ID	19781
identificacion NK ČR	ph150526
identificant BNE	XX526711
identificant BNF	11979118t
identificant ChEBI	33325
identificant ChemSpider	4886483
identificant DSSTOX de substància	DTXSID2024294
identificant Enciclopedia Treccani	radio_res-fda11266-e1eb-11df-9962-d5ce3506d72e
identificant Encyclopædia Britannica en linha	science/radium
identificant Freebase	/m/025scm7
identificant GND	4176842-5
identificant MeSH	D011883
identificant NDL	00569336
identificant Nationalencyklopedin Online	radium
identificant PSH	5755
identificant PubChem (CID)	6328144
identificant Quora d'un subjècte	Radium
identificant UNII	W90AYD6R3Q
identificant bibliotèca del Congrès	sh85110804
identificant d'InfoCard ECHA	100.028.293
identificant del thesaurus de la BNCF	18888
numèro CAS	7440-14-4
sens definit OmegaWiki	347064

Radi (Ra)

Proprietat Fisica

Chemical Property

other

Isotopes of Radium

201Ra

202Ra

203Ra

204Ra

205Ra

206Ra

207Ra

208Ra

209Ra

210Ra

211Ra

212Ra

213Ra

214Ra

215Ra

216Ra

217Ra

218Ra

219Ra

220Ra

221Ra

222Ra

223Ra

224Ra

225Ra

226Ra

227Ra

228Ra

229Ra

230Ra

231Ra

232Ra

233Ra

234Ra

235Ra

istòria

source

Nuclear Screening Constants

²⁰¹Ra

²⁰²Ra

²⁰³Ra

²⁰⁴Ra

²⁰⁵Ra

²⁰⁶Ra

²⁰⁷Ra

²⁰⁸Ra

²⁰⁹Ra

²¹⁰Ra

²¹¹Ra

²¹²Ra

²¹³Ra

²¹⁴Ra

²¹⁵Ra

²¹⁶Ra

²¹⁷Ra

²¹⁸Ra

²¹⁹Ra

²²⁰Ra

²²¹Ra

²²²Ra

²²³Ra

²²⁴Ra

²²⁵Ra

²²⁶Ra

²²⁷Ra

²²⁸Ra

²²⁹Ra

²³⁰Ra

²³¹Ra

²³²Ra

²³³Ra

²³⁴Ra

²³⁵Ra