Rādijs (Ra)

chemical element with the atomic number of 88

Atomic Number	88
Atomic Weight	226
Masas skaitlis	201

Group	2
Period	7
Block	s

protons	88 p⁺
neitrons	113 n⁰
elektrons	88 e^-

Animated Bora atoma struktūras modelis of Ra (Rādijs)

Fizikāla Īpašība

Atoma Rādiuss	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
blīvums	5 g/cm³

Chemical Property

enerģija

proton affinity
Elektrontieksme	0,1 eV/particle
jonizācijas potenciāls	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
elektrons

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

vērtības elektrons	2 ⓘ

elektronu konfigurācija	[Rn] 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s²

Oksidēšanas pakāpe	2
elektronegativitāte	0.09789 0.9
Electrophilicity Index	0,6982685447294388 eV/particle
fundamentālais agregātstāvoklis

agregātstāvoklis	Solid
gaseous state of matter
Boiling Point
Melting Point	969,15 K
critical pressure
critical temperature
trīskāršais punkts
appearance
krāsa	Silver #ffffff #007d00 #007d00
appearance	silvery white metallic
Laušanas koeficients
thermodynamic material property
Thermal Conductivity
Termiskā izplešanās
Molārā siltumietilpība
Specific Heat Capacity
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	1 MS/m
īpatnējā pretestība	0,000001 Ω*m
Supravadītspēja
Magnētisms
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
struktūra
Crystal Structure	Body Centered Cubic ()
lattice constant
Lattice Angles	π/2, π/2, π/2
mechanical property
Cietība
tilpuma elastības modulis
shear modulus
Junga modulis
Poisson's ratio
skaņas ātrums
klasifikācija
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

Masas skaitlis	201
neutron number	113
Relative Atomic Mass	201,012814699 ± 0,000021794 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	20 ± 30 ms
spins	3/2
nuclear quadrupole moment
atklāšanas datums	2005
parity	-

decay mode	intensity
α (α emission)	100%

²⁰²Ra

Masas skaitlis	202
neutron number	114
Relative Atomic Mass	202,009742305 ± 0,000016122 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	4,1 ± 1,1 ms
spins	0
nuclear quadrupole moment	0
atklāšanas datums	2005
parity	+

decay mode	intensity
α (α emission)	100%

²⁰³Ra

Masas skaitlis	203
neutron number	115
Relative Atomic Mass	203,009233907 ± 0,0000104 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	36 ± 13 ms
spins	3/2
nuclear quadrupole moment
atklāšanas datums	1996
parity	-

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

²⁰⁴Ra

Masas skaitlis	204
neutron number	116
Relative Atomic Mass	204,006506855 ± 0,00000958 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	60 ± 9 ms
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1995
parity	+

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

²⁰⁵Ra

Masas skaitlis	205
neutron number	117
Relative Atomic Mass	205,006230692 ± 0,000024446 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	220 ± 50 ms
spins	3/2
nuclear quadrupole moment
atklāšanas datums	1987
parity	-

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

²⁰⁶Ra

Masas skaitlis	206
neutron number	118
Relative Atomic Mass	206,003827842 ± 0,000019332 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	240 ± 20 ms
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1967
parity	+

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

²⁰⁷Ra

Masas skaitlis	207
neutron number	119
Relative Atomic Mass	207,00377242 ± 0,000062572 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	1,38 ± 0,18 s
spins	5/2
nuclear quadrupole moment
atklāšanas datums	1967
parity	-

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

²⁰⁸Ra

Masas skaitlis	208
neutron number	120
Relative Atomic Mass	208,001855012 ± 0,000009686 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	1,11 ± 0,045 s
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1967
parity	+

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

²⁰⁹Ra

Masas skaitlis	209
neutron number	121
Relative Atomic Mass	209,001994902 ± 0,000006169 Da
g-factor	0,3444 ± 0,0052
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	4,71 ± 0,08 s
spins	5/2
nuclear quadrupole moment	0,39 ± 0,04
atklāšanas datums	1967
parity	-

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

²¹⁰Ra

Masas skaitlis	210
neutron number	122
Relative Atomic Mass	210,000475406 ± 0,000009868 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	4 ± 0,1 s
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1967
parity	+

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

²¹¹Ra

Masas skaitlis	211
neutron number	123
Relative Atomic Mass	211,000893049 ± 0,000005331 Da
g-factor	0,3496 ± 0,0016
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	12,6 ± 1,2 s
spins	5/2
nuclear quadrupole moment	0,46 ± 0,04
atklāšanas datums	1967
parity	-

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

²¹²Ra

Masas skaitlis	212
neutron number	124
Relative Atomic Mass	211,999786619 ± 0,000011007 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	13 ± 0,2 s
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1967
parity	+

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

²¹³Ra

Masas skaitlis	213
neutron number	125
Relative Atomic Mass	213,000370971 ± 0,00001054 Da
g-factor	1,22 ± 0,004
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	2,73 ± 0,05 m
spins	1/2
nuclear quadrupole moment	0
atklāšanas datums	1955
parity	-

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

²¹⁴Ra

Masas skaitlis	214
neutron number	126
Relative Atomic Mass	214,00009956 ± 0,000005636 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	2,437 ± 0,016 s
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1967
parity	+

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

²¹⁵Ra

Masas skaitlis	215
neutron number	127
Relative Atomic Mass	215,002718208 ± 0,00000773 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	1,669 ± 0,009 ms
spins	9/2
nuclear quadrupole moment
atklāšanas datums	1967
parity	+

decay mode	intensity
α (α emission)	100%

²¹⁶Ra

Masas skaitlis	216
neutron number	128
Relative Atomic Mass	216,003533534 ± 0,000008592 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	172 ± 7 ns
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1972
parity	+

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

²¹⁷Ra

Masas skaitlis	217
neutron number	129
Relative Atomic Mass	217,006322676 ± 0,000007564 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	1,95 ± 0,12 us
spins	9/2
nuclear quadrupole moment
atklāšanas datums	1970
parity	+

decay mode	intensity
α (α emission)	100%

²¹⁸Ra

Masas skaitlis	218
neutron number	130
Relative Atomic Mass	218,007134297 ± 0,000010528 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	25,91 ± 0,14 us
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1970
parity	+

decay mode	intensity
α (α emission)	100%

²¹⁹Ra

Masas skaitlis	219
neutron number	131
Relative Atomic Mass	219,010084715 ± 0,000007315 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	9 ± 2 ms
spins	7/2
nuclear quadrupole moment
atklāšanas datums	1952
parity

decay mode	intensity
α (α emission)	100%

²²⁰Ra

Masas skaitlis	220
neutron number	132
Relative Atomic Mass	220,011027542 ± 0,000008153 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	18,1 ± 1,2 ms
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1949
parity	+

decay mode	intensity
α (α emission)	100%

²²¹Ra

Masas skaitlis	221
neutron number	133
Relative Atomic Mass	221,013917293 ± 0,00000497 Da
g-factor	-0,0716 ± 0,00068
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	25 ± 4 s
spins	5/2
nuclear quadrupole moment	1,92 ± 0,06
atklāšanas datums	1949
parity	+

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

²²²Ra

Masas skaitlis	222
neutron number	134
Relative Atomic Mass	222,015373371 ± 0,000004781 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	33,6 ± 0,4 s
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1948
parity	+

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

²²³Ra

Masas skaitlis	223
neutron number	135
Relative Atomic Mass	223,018500648 ± 0,000002243 Da
g-factor	0,17946666666667 ± 0,00053333333333333
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	11,4352 ± 0,001 d
spins	3/2
nuclear quadrupole moment	1,22 ± 0,03
atklāšanas datums	1905
parity	+

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

²²⁴Ra

Masas skaitlis	224
neutron number	136
Relative Atomic Mass	224,020210361 ± 0,000001944 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	3,6316 ± 0,0014 d
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1902
parity	+

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

²²⁵Ra

Masas skaitlis	225
neutron number	137
Relative Atomic Mass	225,023610502 ± 0,000002786 Da
g-factor	-1,46 ± 0,004
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	14,82 ± 0,19 d
spins	1/2
nuclear quadrupole moment	0
atklāšanas datums	1947
parity	+

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

²²⁶Ra

Masas skaitlis	226
neutron number	138
Relative Atomic Mass	226,025408186 ± 0,000002068 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	1,6 ± 0,007 ky
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1898
parity	+

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

²²⁷Ra

Masas skaitlis	227
neutron number	139
Relative Atomic Mass	227,029176205 ± 0,000002089 Da
g-factor	-0,26733333333333 ± 0,00073333333333333
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	42,2 ± 0,5 m
spins	3/2
nuclear quadrupole moment	1,53 ± 0,06
atklāšanas datums	1953
parity	+

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

²²⁸Ra

Masas skaitlis	228
neutron number	140
Relative Atomic Mass	228,031068574 ± 0,000002141 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	5,75 ± 0,03 y
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1907
parity	+

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

²²⁹Ra

Masas skaitlis	229
neutron number	141
Relative Atomic Mass	229,034956703 ± 0,000016576 Da
g-factor	0,19968 ± 0,00056
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	4 ± 0,2 m
spins	5/2
nuclear quadrupole moment	2,99 ± 0,12
atklāšanas datums	1975
parity	+

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

²³⁰Ra

Masas skaitlis	230
neutron number	142
Relative Atomic Mass	230,037054776 ± 0,000011053 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	93 ± 2 m
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1978
parity	+

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

²³¹Ra

Masas skaitlis	231
neutron number	143
Relative Atomic Mass	231,041027085 ± 0,000012206 Da
g-factor	-0,14216 ± 0,00044
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	104 ± 1 s
spins	5/2
nuclear quadrupole moment
atklāšanas datums	1983
parity	+

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

²³²Ra

Masas skaitlis	232
neutron number	144
Relative Atomic Mass	232,043475267 ± 0,000009823 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	4 ± 0,3 m
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1983
parity	+

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

²³³Ra

Masas skaitlis	233
neutron number	145
Relative Atomic Mass	233,04759457 ± 0,000009235 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	30 ± 5 s
spins	1/2
nuclear quadrupole moment	0
atklāšanas datums	1990
parity	+

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

²³⁴Ra

Masas skaitlis	234
neutron number	146
Relative Atomic Mass	234,0503821 ± 0,000009 Da
g-factor	0
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods	30 ± 10 s
spins	0
nuclear quadrupole moment	0
atklāšanas datums	1990
parity	+

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

²³⁵Ra

Masas skaitlis	235
neutron number	147
Relative Atomic Mass	235,05489 ± 0,000322 Da
g-factor
natural abundance
radioaktivitāte	☢️ radioactive element
Pussabrukšanas periods
spins	5/2
nuclear quadrupole moment
atklāšanas datums
parity	+

decay mode	intensity
β⁻ (β⁻ decay)

vēsture

atklājējs vai izgudrotājs	Pierre and Marie Curie
atraduma atrašanās vieta	France
atklāšanas datums	1898
Etimoloģija	Latin: radius (ray).
izruna	RAY-di-em (angļu)

avots

Abundance
Abundance in Earth's crust	0,0000009 mg/kg
natural abundance (okeāns)	0,000000000089 mg/L
natural abundance (cilvēka ķermenis)	0,0000000000001 %
natural abundance (meteoroīds)
natural abundance (Saule)
Abundance in Universe	0 %

Nuclear Screening Constants

Rādijs on ChemicalAid

AEDA subject keyword ID	17547
Austrālijas Izglītības vārdnīcas identifikators	scot/3564
BNCF	18888
BNE identifikators	XX526711
BNF kods	11979118t
Brockhaus Enzyklopädie online ID	radium
CAB ID	18810
CAS reģistrācijas numurs	7440-14-4
ChEBI ID	33325
ChemSpider ID	4886483
DSSTOX compound identifier	DTXCID70875702
DSSTox identifikators	DTXSID2024294
Den Store Danske ID	radium
ECHA Substance Infocard ID	100.028.293
Enciklopēdijas "Krugosvet" raksts	nauka_i_tehnika/himiya/RADI.html
Encyclopædia Britannica tiešsaistes ID	science/radium
Encyclopædia Universalis ID	radium
Freebase identifikators	/m/025scm7
French Vikidia ID	Radium
GND identifikators	4176842-5
Golden ID	Radium-ZX5K8
InChI	InChI=1S/Ra
InChIKey	HCWPIIXVSYCSAN-UHFFFAOYSA-N
KBpedia ID	Radium
Krievijas Lielās enciklopēdijas tiešsaistes kods	3489135
LCCN identifikators	sh85110804
MeSH ID	D011883
NDL identifikators	00569336
NE.se ID	radium
NKC identifikators	ph150526
Namuwiki ID	라듐
National Library of Israel J9U ID	987007560614605171
OmegaWiki definētā nozīme	347064
Online PWN Encyclopedia ID	3965238
OpenAlex ID	C550196577
PSH ID	5755
PubChem ID (CID)	6328144
Quora temata 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

Rādijs (Ra)

Fizikāla Īpašība

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

vēsture

avots

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