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

protoni	88 p⁺
nyutroni	113 n⁰
elektroni	88 e^-

Physical Property

Atomic Radius	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
Van der Waals radius	283 pm 327 pm 283 pm 367.7 pm
msongamano	5 g/cm³

Chemical Property

nishati

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 1,040 eV/particle 1,110 eV/particle 1,180 eV/particle 1,250 eV/particle 1,320 eV/particle 1,390 eV/particle 1,460 eV/particle 1,530 eV/particle 1,610 eV/particle 1,680 eV/particle 1,750 eV/particle 1,820 eV/particle 1,880 eV/particle 2,208 eV/particle 2,271 eV/particle 2,338 eV/particle 2,409 eV/particle 2,477 eV/particle 2,544 eV/particle 2,662 eV/particle 2,731 eV/particle 2,806 eV/particle 2,876 eV/particle 3,155 eV/particle 3,224 eV/particle 3,300 eV/particle 3,368 eV/particle 3,682 eV/particle 3,762 eV/particle 3,959 eV/particle 4,040 eV/particle 6,565 eV/particle 6,718 eV/particle 6,881 eV/particle 7,056 eV/particle 7,222 eV/particle 7,380 eV/particle 7,720 eV/particle 7,890 eV/particle 8,080 eV/particle 8,250 eV/particle 8,730 eV/particle 8,880 eV/particle 9,040 eV/particle 9,200 eV/particle 10,190 eV/particle 10,360 eV/particle 10,720 eV/particle 10,890 eV/particle 22,900 eV/particle 23,300 eV/particle 23,750 eV/particle 24,160 eV/particle 27,830 eV/particle 28,370 eV/particle 29,050 eV/particle 29,479.8 eV/particle 116,848.7 eV/particle 118,931.3 eV/particle

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

Mzingo elektroni	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
electronegativity	0.09789 0.9
Electrophilicity Index	0.6982685447294388 eV/particle
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point
Melting Point	969.15 K
critical pressure
critical temperature
Kiwango utatu
appearance
Rangi	Silver #ffffff #007d00 #007d00
appearance	silvery white metallic
refractive index
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
Uga sumaku
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal Structure	Body Centered Cubic ()
lattice constant
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness
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
Unururifu	☢️ radioactive element
Nusumaisha	20 ± 30 ms
spin	3/2
nuclear quadrupole moment
Uvumbuzi	2005
parity	-

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	4.1 ± 1.1 ms
spin	0
nuclear quadrupole moment	0
Uvumbuzi	2005
parity	+

hali ya kuoza	intensity
α (α emission)	100%

²⁰³Ra

mass number	203
neutron number	115
Relative Atomic Mass	203.009233907 ± 0.0000104 Da
g-factor
natural abundance
Unururifu	☢️ radioactive element
Nusumaisha	36 ± 13 ms
spin	3/2
nuclear quadrupole moment
Uvumbuzi	1996
parity	-

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	60 ± 9 ms
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1995
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	220 ± 50 ms
spin	3/2
nuclear quadrupole moment
Uvumbuzi	1987
parity	-

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	240 ± 20 ms
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1967
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	1.38 ± 0.18 s
spin	5/2
nuclear quadrupole moment
Uvumbuzi	1967
parity	-

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	1.11 ± 0.045 s
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1967
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	4.71 ± 0.08 s
spin	5/2
nuclear quadrupole moment	0.39 ± 0.04
Uvumbuzi	1967
parity	-

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	4 ± 0.1 s
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1967
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	12.6 ± 1.2 s
spin	5/2
nuclear quadrupole moment	0.46 ± 0.04
Uvumbuzi	1967
parity	-

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	13 ± 0.2 s
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1967
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	2.73 ± 0.05 m
spin	1/2
nuclear quadrupole moment	0
Uvumbuzi	1955
parity	-

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	2.437 ± 0.016 s
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1967
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	1.669 ± 0.009 ms
spin	9/2
nuclear quadrupole moment
Uvumbuzi	1967
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	172 ± 7 ns
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1972
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	1.95 ± 0.12 us
spin	9/2
nuclear quadrupole moment
Uvumbuzi	1970
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	25.91 ± 0.14 us
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1970
parity	+

hali ya kuoza	intensity
α (α emission)	100%

²¹⁹Ra

mass number	219
neutron number	131
Relative Atomic Mass	219.010084715 ± 0.000007315 Da
g-factor
natural abundance
Unururifu	☢️ radioactive element
Nusumaisha	9 ± 2 ms
spin	7/2
nuclear quadrupole moment
Uvumbuzi	1952
parity

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	18.1 ± 1.2 ms
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1949
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	25 ± 4 s
spin	5/2
nuclear quadrupole moment	1.92 ± 0.06
Uvumbuzi	1949
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	33.6 ± 0.4 s
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1948
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	11.4352 ± 0.001 d
spin	3/2
nuclear quadrupole moment	1.22 ± 0.03
Uvumbuzi	1905
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	3.6316 ± 0.0014 d
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1902
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	14.82 ± 0.19 d
spin	1/2
nuclear quadrupole moment	0
Uvumbuzi	1947
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	1.6 ± 0.007 ky
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1898
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	42.2 ± 0.5 m
spin	3/2
nuclear quadrupole moment	1.53 ± 0.06
Uvumbuzi	1953
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	5.75 ± 0.03 y
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1907
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	4 ± 0.2 m
spin	5/2
nuclear quadrupole moment	2.99 ± 0.12
Uvumbuzi	1975
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	93 ± 2 m
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1978
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	104 ± 1 s
spin	5/2
nuclear quadrupole moment
Uvumbuzi	1983
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	4 ± 0.3 m
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1983
parity	+

hali ya kuoza	intensity
β⁻ (β⁻ decay)	100%

²³³Ra

mass number	233
neutron number	145
Relative Atomic Mass	233.04759457 ± 0.000009235 Da
g-factor
natural abundance
Unururifu	☢️ radioactive element
Nusumaisha	30 ± 5 s
spin	1/2
nuclear quadrupole moment	0
Uvumbuzi	1990
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha	30 ± 10 s
spin	0
nuclear quadrupole moment	0
Uvumbuzi	1990
parity	+

hali ya kuoza	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
Unururifu	☢️ radioactive element
Nusumaisha
spin	5/2
nuclear quadrupole moment
Uvumbuzi
parity	+

hali ya kuoza	intensity
β⁻ (β⁻ decay)

historia

mgunduzi au mvumbuzi	Pierre and Marie Curie
location of discovery	France
Uvumbuzi	1898
Etimolojia	Latin: radius (ray).
pronunciation	RAY-di-em (Kiingereza)

source

Abundance
Abundance in Earth's crust	0.0000009 mg/kg
natural abundance (Bahari)	0.000000000089 mg/L
natural abundance (Mwili)	0.0000000000001 %
natural abundance (Kimondo)
natural abundance (Jua)
Abundance in Universe	0 %

Nuclear Screening Constants

Radi on ChemicalAid

AEDA subject keyword ID	17547
Australian Educational Vocabulary ID	scot/3564
BNCF Thesaurus ID	18888
Biblioteca Nacional de España ID	XX526711
Bibliothèque nationale de France ID	11979118t
Brockhaus Enzyklopädie online ID	radium
CAB ID	18810
CAS Registry Number	7440-14-4
ChEBI ID	33325
ChemSpider ID	4886483
DSSTOX compound identifier	DTXCID70875702
DSSTox substance ID	DTXSID2024294
Den Store Danske ID	radium
ECHA Substance Infocard ID	100.028.293
Encyclopædia Britannica Online ID	science/radium
Encyclopædia Universalis ID	radium
Freebase ID	/m/025scm7
French Vikidia ID	Radium
GND	4176842-5
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
Library of Congress authority ID	sh85110804
MeSH descriptor ID	D011883
NDL Authority ID	00569336
NE.se ID	radium
NKCR AUT ID	ph150526
Namuwiki ID	라듐
National Library of Israel J9U ID	987007560614605171
OmegaWiki Defined Meaning	347064
Online PWN Encyclopedia ID	3965238
OpenAlex ID	C550196577
PSH ID	5755
PubChem CID	6328144
Quora topic ID	Radium
RxNorm ID	1546450
Spanish Vikidia ID	Radio_(elemento_químico)
Store medisinske leksikon ID	radium
Store norske leksikon ID	radium
The Encyclopedia of Science Fiction ID	radium
Treccani ID	radio_res-fda11266-e1eb-11df-9962-d5ce3506d72e
UK Archival Thesaurus ID	f2/mt225/4347/5017
UNESCO Thesaurus ID	concept14022
UNII	W90AYD6R3Q
USGS Thesaurus ID	1551
WordNet 3.1 Synset ID	14676100-n
YSO ID	19781

Radi (Ra)

Physical Property

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

historia

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