Isotopes of radium 1

Isotopes of radiumRadium (Ra) has no stable or nearly stable isotopes, and thus a standard atomic mass cannot be given. The longestlived, and most common, isotope of radium is 226Ra with a half-life of 1600 years. 226Ra occurs in the decay chainof 238U (often referred to as the radium series.) Radium has 35 known isotopes from 201Ra to 235Ra, with the isotopemost recently discovered being 235Ra.

Table

nuclidesymbol

historicname

Z(p) N(n) isotopic mass(u)

half-life decaymode(s)[1][2]

daughterisotope(s)[3]

nuclearspin

representativeisotopic

composition(mole

fraction)

range ofnatural

variation(mole

fraction)excitation energy

202Ra 88 114 202.00989(7) 2.6(21) ms[0.7(+33-3)ms]

0+

203Ra 88 115 203.00927(9) 4(3) ms α 199Rn (3/2-)

β+ (rare) 203Fr203mRa 220(90) keV 41(17) ms α 199Rn (13/2+)

β+ (rare) 203Fr204Ra 88 116 204.006500(17) 60(11) ms

[59(+12-9)ms]

α (99.7%) 200Rn 0+

β+ (.3%) 204Fr205Ra 88 117 205.00627(9) 220(40) ms

[210(+60-40)ms]

α 201Rn (3/2-)

β+ (rare) 205Fr205mRa 310(110)# keV 180(50) ms

[170(+60-40)ms]

α 201Rn (13/2+)

IT (rare) 205Ra206Ra 88 118 206.003827(19) 0.24(2) s α 202Rn 0+

207Ra 88 119 207.00380(6) 1.3(2) s α (90%) 203Rn (5/2-,3/2-)

β+ (10%) 207Fr207mRa 560(50) keV 57(8) ms IT (85%) 207Ra (13/2+)

α (15%) 203Rn

β+ (.55%) 207Fr208Ra 88 120 208.001840(17) 1.3(2) s α (95%) 204Rn 0+

β+ (5%) 208Fr208mRa 1800(200) keV 270 ns (8+)

209Ra 88 121 209.00199(5) 4.6(2) s α (90%) 205Rn 5/2-

β+ (10%) 209Fr

Isotopes of radium 2

210Ra 88 122 210.000495(16) 3.7(2) s α (96%) 206Rn 0+

β+ (4%) 210Fr210mRa 1800(200) keV 2.24 µs (8+)

211Ra 88 123 211.000898(28) 13(2) s α (97%) 207Rn 5/2(-)

β+ (3%) 211Fr212Ra 88 124 211.999794(12) 13.0(2) s α (85%) 208Rn 0+

β+ (15%) 212Fr212m1Ra 1958.4(5) keV 10.9(4) µs (8)+

212m2Ra 2613.4(5) keV 0.85(13) µs (11)-

213Ra 88 125 213.000384(22) 2.74(6) min α (80%) 209Rn 1/2-

β+ (20%) 213Fr213mRa 1769(6) keV 2.1(1) ms IT (99%) 213Ra 17/2-#

α (1%) 209Rn214Ra 88 126 214.000108(10) 2.46(3) s α (99.94%) 210Rn 0+

β+ (.06%) 214Fr215Ra 88 127 215.002720(8) 1.55(7) ms α 211Rn (9/2+)#

215m1Ra 1877.8(5) keV 7.1(2) µs (25/2+)

215m2Ra 2246.9(5) keV 1.39(7) µs (29/2-)

215m3Ra 3756.6(6)+X keV 0.555(10) µs (43/2-)

216Ra 88 128 216.003533(9) 182(10) ns α 212Rn 0+

EC(1×10−8%)

216Fr

217Ra 88 129 217.006320(9) 1.63(17) µs α 213Rn (9/2+)

218Ra 88 130 218.007140(12) 25.2(3) µs α 214Rn 0+

β+β+ (rare) 218Rn219Ra 88 131 219.010085(9) 10(3) ms α 215Rn (7/2)+

220Ra 88 132 220.011028(10) 17.9(14) ms α 216Rn 0+

221Ra 88 133 221.013917(5) 28(2) s α 217Rn 5/2+

CD(1.2×10−10%)

207Pb14C

222Ra 88 134 222.015375(5) 38.0(5) s α 218Rn 0+ Trace[4]

CD(3×10−8%)

208Pb14C

Isotopes of radium 3

223Ra Actinium X 88 135 223.0185022(27) 11.43(5) d α 219Rn 3/2+ Trace[5]

CD(6.4×10−8%)

209Pb14C

224Ra Thorium X 88 136 224.0202118(24) 3.6319(23) d α 220Rn 0+ Trace[6]

CD(4.3×10−9%)

210Pb14C

225Ra 88 137 225.023612(3) 14.9(2) d β- 225Ac 1/2+

226Ra Radium[7] 88 138 226.0254098(25) 1600(7) y α 222Rn 0+ Trace[8]

β-β- (rare) 226Th

CD(2.6×10−9%)

212Pb14C

227Ra 88 139 227.0291778(25) 42.2(5) min β- 227Ac 3/2+

228Ra Mesothorium1

88 140 228.0310703(26) 5.75(3) y β- 228Ac 0+ Trace

229Ra 88 141 229.034958(20) 4.0(2) min β- 229Ac 5/2(+)

230Ra 88 142 230.037056(13) 93(2) min β- 230Ac 0+

231Ra 88 143 231.04122(32)# 103(3) s β- 231Ac (5/2+)

231mRa 66.21(9) keV ~53 µs (1/2+)

232Ra 88 144 232.04364(30)# 250(50) s β- 232Ac 0+

233Ra 88 145 233.04806(50)# 30(5) s β- 233Ac 1/2+#

234Ra 88 146 234.05070(53)# 30(10) s β- 234Ac 0+

[1] http:/ / www. nucleonica. net/ unc. aspx[2] Abbreviations:

CD: Cluster decayEC: Electron captureIT: Isomeric transition

[3][3] Bold for stable isotopes[4] Intermediate decay product of 238U[5] Intermediate decay product of 235U[6] Intermediate decay product of 232Th[7][7] Source of element's name[8] Intermediate decay product of 238U

Notes•• Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins

with weak assignment arguments are enclosed in parentheses.•• Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values

denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which useexpanded uncertainties.

Isotopes of radium 4

References•• Isotope masses from:

• G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclearand decay properties" (http:/ / www. nndc. bnl. gov/ amdc/ nubase/ Nubase2003. pdf). Nuclear Physics A 729:3–128. Bibcode: 2003NuPhA.729....3A (http:/ / adsabs. harvard. edu/ abs/ 2003NuPhA. 729. . . . 3A). doi:10.1016/j.nuclphysa.2003.11.001 (http:/ / dx. doi. org/ 10. 1016/ j. nuclphysa. 2003. 11. 001).

•• Isotopic compositions and standard atomic masses from:• J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor

(2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)" (http:/ / www. iupac. org/publications/ pac/ 75/ 6/ 0683/ pdf/ ). Pure and Applied Chemistry 75 (6): 683–800. doi:10.1351/pac200375060683 (http:/ / dx. doi. org/ 10. 1351/ pac200375060683).

• M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)" (http:/ / iupac. org/publications/ pac/ 78/ 11/ 2051/ pdf/ ). Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051 (http:/ / dx. doi. org/ 10. 1351/ pac200678112051). Lay summary (http:/ / old.iupac. org/ news/ archives/ 2005/ atomic-weights_revised05. html).

• Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.• G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear

and decay properties" (http:/ / www. nndc. bnl. gov/ amdc/ nubase/ Nubase2003. pdf). Nuclear Physics A 729:3–128. Bibcode: 2003NuPhA.729....3A (http:/ / adsabs. harvard. edu/ abs/ 2003NuPhA. 729. . . . 3A). doi:10.1016/j.nuclphysa.2003.11.001 (http:/ / dx. doi. org/ 10. 1016/ j. nuclphysa. 2003. 11. 001).

• National Nuclear Data Center. "NuDat 2.1 database" (http:/ / www. nndc. bnl. gov/ nudat2/ ). BrookhavenNational Laboratory. Retrieved September 2005.

• N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide. CRC Handbook of Chemistry and Physics (85thed.). CRC Press. Section 11. ISBN 978-0-8493-0485-9.

Isotopes of francium Isotopes of radium Isotopes of actinium

Table of nuclides

Article Sources and Contributors 5

Article Sources and ContributorsIsotopes of radium  Source: https://en.wikipedia.org/w/index.php?oldid=601085883  Contributors: 3.14159265358pi, 777sms, Balgontork, Bryan Derksen, Femto, Headbomb, Hellbus,Latifahphysics, Rjwilmsi, Robertsteadman, Speciman00, StringTheory11, Urhixidur, XinaNicole, Zanhsieh, 9 anonymous edits

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