Radium (Ra)

chemical element with the atomic number of 88

Atomic Number	88
Atomic Weight	226
Nombor jisim	201

Group	2
Period	7
Block	s

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

Sifat Fizikal

Jejari Atom	215 pm 292 pm
molar volume	45 cm³/mol
Jejari kovalen	201 pm 173 pm 159 pm 221 pm
Metallic Radius
ionic radius	148 pm 170 pm
Crystal Radius	162 pm 184 pm
Jejari van der Waals	283 pm 327 pm 283 pm 367.7 pm
ketumpatan	5 g/cm³

Sifat Kimia

tenaga

proton affinity
Pertalian elektron	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

Entalpi pengewapan	113 kJ/mol
entalpi pelakuran	9.6 kJ/mol
standard enthalpy of formation	159 kJ/mol
Elektron

Petala elektron	2, 8, 18, 32, 18, 8, 2

Elektron valens	2 ⓘ

tatarajah elektron	[Rn] 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s²

Keadaan pengoksidaan	2
Keelektronegatifan	0.09789 0.9
Electrophilicity Index	0.6982685447294388 eV/particle
keadaan jirim asas

fasa jirim	Solid
gaseous state of matter
Boiling Point
Melting Point	969.15 K
critical pressure
critical temperature
triple point
rupa
warna	Silver #ffffff #007d00 #007d00
rupa	silvery white metallic
indeks biasan
sifat bahan
Thermal Conductivity
Pengembangan terma
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type	Conductor
Kekonduksian elektrik	1 MS/m
Kerintangan dan kekonduksian elektrik	0.000001 Ω*m
Kesuperkonduksian
kemagnetan
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Suhu Curie
Néel temperature
struktur
Crystal Structure	Body Centered Cubic ()
lattice constant
Lattice Angles	π/2, π/2, π/2
mechanical property
hardness
Modulus pukal
shear modulus
Young's modulus
Nisbah Poisson
Kelajuan bunyi
pengelasan
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
Nombor kuantum	1S0
space group	229 (Im_3m)

Isotopes of Radium

Stable Isotopes	0
Unstable Isotopes	35
Natural Isotopes	0

²⁰¹Ra

Nombor jisim	201
nombor neutron	113
Jisim Atom Relatif	201.012814699 ± 0.000021794 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	20 ± 30 ms
Spin	3/2
nuclear quadrupole moment
tarikh penemuan	2005
parity	-

decay mode	Keamatan (fizik)
α (α emission)	100%

²⁰²Ra

Nombor jisim	202
nombor neutron	114
Jisim Atom Relatif	202.009742305 ± 0.000016122 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	4.1 ± 1.1 ms
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	2005
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%

²⁰³Ra

Nombor jisim	203
nombor neutron	115
Jisim Atom Relatif	203.009233907 ± 0.0000104 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	36 ± 13 ms
Spin	3/2
nuclear quadrupole moment
tarikh penemuan	1996
parity	-

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

²⁰⁴Ra

Nombor jisim	204
nombor neutron	116
Jisim Atom Relatif	204.006506855 ± 0.00000958 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	60 ± 9 ms
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1995
parity	+

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

²⁰⁵Ra

Nombor jisim	205
nombor neutron	117
Jisim Atom Relatif	205.006230692 ± 0.000024446 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	220 ± 50 ms
Spin	3/2
nuclear quadrupole moment
tarikh penemuan	1987
parity	-

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

²⁰⁶Ra

Nombor jisim	206
nombor neutron	118
Jisim Atom Relatif	206.003827842 ± 0.000019332 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	240 ± 20 ms
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1967
parity	+

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

²⁰⁷Ra

Nombor jisim	207
nombor neutron	119
Jisim Atom Relatif	207.00377242 ± 0.000062572 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.38 ± 0.18 s
Spin	5/2
nuclear quadrupole moment
tarikh penemuan	1967
parity	-

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

²⁰⁸Ra

Nombor jisim	208
nombor neutron	120
Jisim Atom Relatif	208.001855012 ± 0.000009686 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.11 ± 0.045 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1967
parity	+

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

²⁰⁹Ra

Nombor jisim	209
nombor neutron	121
Jisim Atom Relatif	209.001994902 ± 0.000006169 Da
g-factor	0.3444 ± 0.0052
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	4.71 ± 0.08 s
Spin	5/2
nuclear quadrupole moment	0.39 ± 0.04
tarikh penemuan	1967
parity	-

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

²¹⁰Ra

Nombor jisim	210
nombor neutron	122
Jisim Atom Relatif	210.000475406 ± 0.000009868 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	4 ± 0.1 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1967
parity	+

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

²¹¹Ra

Nombor jisim	211
nombor neutron	123
Jisim Atom Relatif	211.000893049 ± 0.000005331 Da
g-factor	0.3496 ± 0.0016
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	12.6 ± 1.2 s
Spin	5/2
nuclear quadrupole moment	0.46 ± 0.04
tarikh penemuan	1967
parity	-

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

²¹²Ra

Nombor jisim	212
nombor neutron	124
Jisim Atom Relatif	211.999786619 ± 0.000011007 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	13 ± 0.2 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1967
parity	+

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

²¹³Ra

Nombor jisim	213
nombor neutron	125
Jisim Atom Relatif	213.000370971 ± 0.00001054 Da
g-factor	1.22 ± 0.004
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	2.73 ± 0.05 m
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1955
parity	-

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

²¹⁴Ra

Nombor jisim	214
nombor neutron	126
Jisim Atom Relatif	214.00009956 ± 0.000005636 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	2.437 ± 0.016 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1967
parity	+

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

²¹⁵Ra

Nombor jisim	215
nombor neutron	127
Jisim Atom Relatif	215.002718208 ± 0.00000773 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.669 ± 0.009 ms
Spin	9/2
nuclear quadrupole moment
tarikh penemuan	1967
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%

²¹⁶Ra

Nombor jisim	216
nombor neutron	128
Jisim Atom Relatif	216.003533534 ± 0.000008592 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	172 ± 7 ns
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1972
parity	+

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

²¹⁷Ra

Nombor jisim	217
nombor neutron	129
Jisim Atom Relatif	217.006322676 ± 0.000007564 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.95 ± 0.12 us
Spin	9/2
nuclear quadrupole moment
tarikh penemuan	1970
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%

²¹⁸Ra

Nombor jisim	218
nombor neutron	130
Jisim Atom Relatif	218.007134297 ± 0.000010528 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	25.91 ± 0.14 us
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1970
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%

²¹⁹Ra

Nombor jisim	219
nombor neutron	131
Jisim Atom Relatif	219.010084715 ± 0.000007315 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	9 ± 2 ms
Spin	7/2
nuclear quadrupole moment
tarikh penemuan	1952
parity

decay mode	Keamatan (fizik)
α (α emission)	100%

²²⁰Ra

Nombor jisim	220
nombor neutron	132
Jisim Atom Relatif	220.011027542 ± 0.000008153 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	18.1 ± 1.2 ms
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1949
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%

²²¹Ra

Nombor jisim	221
nombor neutron	133
Jisim Atom Relatif	221.013917293 ± 0.00000497 Da
g-factor	-0.0716 ± 0.00068
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	25 ± 4 s
Spin	5/2
nuclear quadrupole moment	1.92 ± 0.06
tarikh penemuan	1949
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%
14C	1.2%

²²²Ra

Nombor jisim	222
nombor neutron	134
Jisim Atom Relatif	222.015373371 ± 0.000004781 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	33.6 ± 0.4 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1948
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%
14C	3%

²²³Ra

Nombor jisim	223
nombor neutron	135
Jisim Atom Relatif	223.018500648 ± 0.000002243 Da
g-factor	0.17946666666667 ± 0.00053333333333333
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	11.4352 ± 0.001 d
Spin	3/2
nuclear quadrupole moment	1.22 ± 0.03
tarikh penemuan	1905
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%
14C	8.9%

²²⁴Ra

Nombor jisim	224
nombor neutron	136
Jisim Atom Relatif	224.020210361 ± 0.000001944 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	3.6316 ± 0.0014 d
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1902
parity	+

decay mode	Keamatan (fizik)
α (α emission)	100%
14C	4%

²²⁵Ra

Nombor jisim	225
nombor neutron	137
Jisim Atom Relatif	225.023610502 ± 0.000002786 Da
g-factor	-1.46 ± 0.004
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	14.82 ± 0.19 d
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1947
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²²⁶Ra

Nombor jisim	226
nombor neutron	138
Jisim Atom Relatif	226.025408186 ± 0.000002068 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.6 ± 0.007 ky
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1898
parity	+

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

²²⁷Ra

Nombor jisim	227
nombor neutron	139
Jisim Atom Relatif	227.029176205 ± 0.000002089 Da
g-factor	-0.26733333333333 ± 0.00073333333333333
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	42.2 ± 0.5 m
Spin	3/2
nuclear quadrupole moment	1.53 ± 0.06
tarikh penemuan	1953
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²²⁸Ra

Nombor jisim	228
nombor neutron	140
Jisim Atom Relatif	228.031068574 ± 0.000002141 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	5.75 ± 0.03 y
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1907
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²²⁹Ra

Nombor jisim	229
nombor neutron	141
Jisim Atom Relatif	229.034956703 ± 0.000016576 Da
g-factor	0.19968 ± 0.00056
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	4 ± 0.2 m
Spin	5/2
nuclear quadrupole moment	2.99 ± 0.12
tarikh penemuan	1975
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²³⁰Ra

Nombor jisim	230
nombor neutron	142
Jisim Atom Relatif	230.037054776 ± 0.000011053 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	93 ± 2 m
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1978
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²³¹Ra

Nombor jisim	231
nombor neutron	143
Jisim Atom Relatif	231.041027085 ± 0.000012206 Da
g-factor	-0.14216 ± 0.00044
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	104 ± 1 s
Spin	5/2
nuclear quadrupole moment
tarikh penemuan	1983
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²³²Ra

Nombor jisim	232
nombor neutron	144
Jisim Atom Relatif	232.043475267 ± 0.000009823 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	4 ± 0.3 m
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1983
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²³³Ra

Nombor jisim	233
nombor neutron	145
Jisim Atom Relatif	233.04759457 ± 0.000009235 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	30 ± 5 s
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1990
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

²³⁴Ra

Nombor jisim	234
nombor neutron	146
Jisim Atom Relatif	234.0503821 ± 0.000009 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	30 ± 10 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1990
parity	+

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

²³⁵Ra

Nombor jisim	235
nombor neutron	147
Jisim Atom Relatif	235.05489 ± 0.000322 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	5/2
nuclear quadrupole moment
tarikh penemuan
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)

sejarah

penemu atau pereka	Pierre and Marie Curie
tempat penemuan	France
tarikh penemuan	1898
Etimologi	Latin: radius (ray).
sebutan	RAY-di-em (Inggeris)

sumber

Abundance
Abundance in Earth's crust	0.0000009 mg/kg
natural abundance (lautan)	0.000000000089 mg/L
natural abundance (Tubuh manusia)	0.0000000000001 %
natural abundance (Meteoroid)
natural abundance (Matahari)
Abundance in Universe	0 %

Nuclear Screening Constants

Radium on ChemicalAid

AEDA subject keyword ID	17547
ChEBI ID	33325
ChemSpider ID	4886483
DSSTOX compound identifier	DTXCID70875702
ECHA Substance Infocard ID	100.028.293
Golden ID	Radium-ZX5K8
ID Biblioteca Nacional de España	XX526711
ID BnF	11979118t
ID CAB	18810
ID Den Store Danske	radium
ID Encyclopædia Universalis	radium
ID Ensiklopedia Besar Rusia dalam talian	3489135
ID Ensiklopedia Britannica Dalam Talian	science/radium
ID Freebase	/m/025scm7
ID GND	4176842-5
ID J9U Perpustakaan Negara Israel	987007560614605171
ID KBpedia	Radium
ID NE.se	radium
ID NKCR AUT	ph150526
ID Namuwiki	라듐
ID PSH	5755
ID Perbendaharaan Kata Pendidikan Australia	scot/3564
ID Store norske leksikon	radium
ID Tesaurus BNCF	18888
ID Treccani	radio_res-fda11266-e1eb-11df-9962-d5ce3506d72e
ID Vikidia Perancis	Radium
ID WordNet 3.1 Synset	14676100-n
ID YSO	19781
ID bahan DSSTox	DTXSID2024294
ID dalam talian Brockhaus Enzyklopädie	radium
ID kewibawaan Perpustakaan Kongres	sh85110804
ID pemerihal MeSH	D011883
ID tesaurus UNESCO	concept14022
ID topik Quora	Radium
InChI	InChI=1S/Ra
InChIKey	HCWPIIXVSYCSAN-UHFFFAOYSA-N
Krugosvet article	nauka_i_tehnika/himiya/RADI.html
Maksud Tertakrif OmegaWiki	347064
Online PWN Encyclopedia ID	3965238
OpenAlex ID	C550196577
PubChem CID	6328144
RxNorm ID	1546450
Spanish Vikidia ID	Radio_(elemento_químico)
Store medisinske leksikon ID	radium
The Encyclopedia of Science Fiction ID	radium
UK Archival Thesaurus ID	f2/mt225/4347/5017
UNII	W90AYD6R3Q
USGS Thesaurus ID	1551
nombor pendaftaran CAS	7440-14-4
pengecam NDL	00569336

Radium (Ra)

Sifat Fizikal

Sifat Kimia

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

sejarah

sumber

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