Radi

Radi (Ra)

chemical element with the atomic number of 88
Atomic Number88
Atomic Weight226
mass number201
Group2
Period7
Blocks
proton88 p+
neutron113 n0
electron88 e-
Animated Bohr model of Ra (Radi)

Proprietat Fisica

Rai Atomic
215 pm
molar volume
covalent radius
201 pm
Metallic Radius
ionic radius
148 pm
Crystal Radius
162 pm
Rai de van der Waals
283 pm
densitat
Atomic Radii Of The Elements: Radi020406080100120140160180200220240260280300pmRai AtomicCovalent RadiusMetallic RadiusRai de van der Waals

Chemical Property

energia
proton affinity
electron affinity
ionization energy
5.278424 eV/particle
ionization energy of Ra (Radi)
enthalpy of vaporization
113 kJ/mol
enthalpy of fusion
9.6 kJ/mol
standard enthalpy of formation
159 kJ/mol
electron
electron shell2, 8, 18, 32, 18, 8, 2
Bohr model: Ra (Radi)
valence electron2
Lewis structure: Ra (Radi)
electron configuration[Rn] 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2
Enhanced Bohr model of Ra (Radi)
Orbital Diagram of Ra (Radi)
oxidation number2
Electronegativitat
0.9
Electrophilicity Index
0.6982685447294388 eV/particle
fundamental state of matter
estat de la matèriaSolid
gaseous state of matter
Boiling Point
Melting Point
969.15 K
critical pressure
critical temperature
Ponch triple
appearance
Color
Silver
appearancesilvery white metallic
Indici de refraccion
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
typeConductor
electrical conductivity
1 MS/m
electrical resistivity
0.000001 m Ω
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
estructura
Crystal StructureBody Centered Cubic ()
lattice constant
Lattice Anglesπ/2, π/2, π/2
mechanical property
Duretat
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
CategoryAlkaline earth metals, Alkaline earth metals
CAS GroupIIA
IUPAC GroupIIA
Glawe Number13
Mendeleev Number10
Pettifor Number13
Geochemical ClassU/Th decay series
Goldschmidt classificationlitophile

other

Gas Basicity
polarizability
246 ± 4 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
13
Neutron Mass Absorption
quantum number1S0
space group229 (Im_3m)

Isotopes of Radium

Stable Isotopes0
Unstable Isotopes35
Natural Isotopes0

201Ra

mass number201
neutron number113
relative atomic mass
201.012814699 ± 0.000021794 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
20 ± 30 ms
Espin3/2
nuclear quadrupole moment
data de descobèrta2005
parity-

decay modeintensity
α (α emission)100%

202Ra

mass number202
neutron number114
relative atomic mass
202.009742305 ± 0.000016122 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
4.1 ± 1.1 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta2005
parity+

decay modeintensity
α (α emission)100%

203Ra

mass number203
neutron number115
relative atomic mass
203.009233907 ± 0.0000104 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
36 ± 13 ms
Espin3/2
nuclear quadrupole moment
data de descobèrta1996
parity-

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

204Ra

mass number204
neutron number116
relative atomic mass
204.006506855 ± 0.00000958 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
60 ± 9 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta1995
parity+

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

205Ra

mass number205
neutron number117
relative atomic mass
205.006230692 ± 0.000024446 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
220 ± 50 ms
Espin3/2
nuclear quadrupole moment
data de descobèrta1987
parity-

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

206Ra

mass number206
neutron number118
relative atomic mass
206.003827842 ± 0.000019332 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
240 ± 20 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta1967
parity+

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

207Ra

mass number207
neutron number119
relative atomic mass
207.00377242 ± 0.000062572 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
1.38 ± 0.18 s
Espin5/2
nuclear quadrupole moment
data de descobèrta1967
parity-

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

208Ra

mass number208
neutron number120
relative atomic mass
208.001855012 ± 0.000009686 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
1.11 ± 0.045 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1967
parity+

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

209Ra

mass number209
neutron number121
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
Espin5/2
nuclear quadrupole moment
0.39 ± 0.04
data de descobèrta1967
parity-

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

210Ra

mass number210
neutron number122
relative atomic mass
210.000475406 ± 0.000009868 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
4 ± 0.1 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1967
parity+

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

211Ra

mass number211
neutron number123
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
Espin5/2
nuclear quadrupole moment
0.46 ± 0.04
data de descobèrta1967
parity-

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

212Ra

mass number212
neutron number124
relative atomic mass
211.999786619 ± 0.000011007 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
13 ± 0.2 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1967
parity+

decay modeintensity
α (α emission)
β+ (β+ decay; β+ = ϵ + e+)

213Ra

mass number213
neutron number125
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
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1955
parity-

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

214Ra

mass number214
neutron number126
relative atomic mass
214.00009956 ± 0.000005636 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
2.437 ± 0.016 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1967
parity+

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

215Ra

mass number215
neutron number127
relative atomic mass
215.002718208 ± 0.00000773 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
1.669 ± 0.009 ms
Espin9/2
nuclear quadrupole moment
data de descobèrta1967
parity+

decay modeintensity
α (α emission)100%

216Ra

mass number216
neutron number128
relative atomic mass
216.003533534 ± 0.000008592 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
172 ± 7 ns
Espin0
nuclear quadrupole moment
0
data de descobèrta1972
parity+

decay modeintensity
α (α emission)100%
ϵ (electron capture)1%

217Ra

mass number217
neutron number129
relative atomic mass
217.006322676 ± 0.000007564 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
1.95 ± 0.12 us
Espin9/2
nuclear quadrupole moment
data de descobèrta1970
parity+

decay modeintensity
α (α emission)100%

218Ra

mass number218
neutron number130
relative atomic mass
218.007134297 ± 0.000010528 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
25.91 ± 0.14 us
Espin0
nuclear quadrupole moment
0
data de descobèrta1970
parity+

decay modeintensity
α (α emission)100%

219Ra

mass number219
neutron number131
relative atomic mass
219.010084715 ± 0.000007315 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
9 ± 2 ms
Espin7/2
nuclear quadrupole moment
data de descobèrta1952
parity

decay modeintensity
α (α emission)100%

220Ra

mass number220
neutron number132
relative atomic mass
220.011027542 ± 0.000008153 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
18.1 ± 1.2 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta1949
parity+

decay modeintensity
α (α emission)100%

221Ra

mass number221
neutron number133
relative atomic mass
221.013917293 ± 0.00000497 Da
g-factor
-0.0716 ± 0.00068
natural abundance
Radioactivitat☢️ radioactive element
Semivida
25 ± 4 s
Espin5/2
nuclear quadrupole moment
1.92 ± 0.06
data de descobèrta1949
parity+

decay modeintensity
α (α emission)100%
14C1.2%

222Ra

mass number222
neutron number134
relative atomic mass
222.015373371 ± 0.000004781 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
33.6 ± 0.4 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1948
parity+

decay modeintensity
α (α emission)100%
14C3%

223Ra

mass number223
neutron number135
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
Espin3/2
nuclear quadrupole moment
1.22 ± 0.03
data de descobèrta1905
parity+

decay modeintensity
α (α emission)100%
14C8.9%

224Ra

mass number224
neutron number136
relative atomic mass
224.020210361 ± 0.000001944 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
3.6316 ± 0.0014 d
Espin0
nuclear quadrupole moment
0
data de descobèrta1902
parity+

decay modeintensity
α (α emission)100%
14C4%

225Ra

mass number225
neutron number137
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
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1947
parity+

decay modeintensity
β (β decay)100%

226Ra

mass number226
neutron number138
relative atomic mass
226.025408186 ± 0.000002068 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
1.6 ± 0.007 ky
Espin0
nuclear quadrupole moment
0
data de descobèrta1898
parity+

decay modeintensity
α (α emission)100%
14C2.6%
(double β decay)

227Ra

mass number227
neutron number139
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
Espin3/2
nuclear quadrupole moment
1.53 ± 0.06
data de descobèrta1953
parity+

decay modeintensity
β (β decay)100%

228Ra

mass number228
neutron number140
relative atomic mass
228.031068574 ± 0.000002141 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
5.75 ± 0.03 y
Espin0
nuclear quadrupole moment
0
data de descobèrta1907
parity+

decay modeintensity
β (β decay)100%

229Ra

mass number229
neutron number141
relative atomic mass
229.034956703 ± 0.000016576 Da
g-factor
0.19968 ± 0.00056
natural abundance
Radioactivitat☢️ radioactive element
Semivida
4 ± 0.2 m
Espin5/2
nuclear quadrupole moment
2.99 ± 0.12
data de descobèrta1975
parity+

decay modeintensity
β (β decay)100%

230Ra

mass number230
neutron number142
relative atomic mass
230.037054776 ± 0.000011053 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
93 ± 2 m
Espin0
nuclear quadrupole moment
0
data de descobèrta1978
parity+

decay modeintensity
β (β decay)100%

231Ra

mass number231
neutron number143
relative atomic mass
231.041027085 ± 0.000012206 Da
g-factor
-0.14216 ± 0.00044
natural abundance
Radioactivitat☢️ radioactive element
Semivida
104 ± 1 s
Espin5/2
nuclear quadrupole moment
data de descobèrta1983
parity+

decay modeintensity
β (β decay)100%

232Ra

mass number232
neutron number144
relative atomic mass
232.043475267 ± 0.000009823 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
4 ± 0.3 m
Espin0
nuclear quadrupole moment
0
data de descobèrta1983
parity+

decay modeintensity
β (β decay)100%

233Ra

mass number233
neutron number145
relative atomic mass
233.04759457 ± 0.000009235 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
30 ± 5 s
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1990
parity+

decay modeintensity
β (β decay)100%

234Ra

mass number234
neutron number146
relative atomic mass
234.0503821 ± 0.000009 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
30 ± 10 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1990
parity+

decay modeintensity
β (β decay)100%
β SF (β-delayed fission)

235Ra

mass number235
neutron number147
relative atomic mass
235.05489 ± 0.000322 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
Espin5/2
nuclear quadrupole moment
data de descobèrta
parity+

decay modeintensity
β (β decay)
Radium226

istòria

descobridor o inventairePierre and Marie Curie
luòc de descobèrtaFrance
data de descobèrta1898
EtimologiaLatin: radius (ray).
pronunciationRAY-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