Isotop fransium
nuklida dengan nomor atom 87 tetapi dengan nomor massa berbeda
Fransium (87Fr) tidak memiliki satu pun isotop stabil, sehingga berat atom standarnya tidak dapat diberikan. Isotopnya yang paling stabil adalah 223Fr dengan waktu paruh 22 menit, terjadi dalam jumlah renik sebagai produk peluruhan antara dari 235U.
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Dari unsur-unsur yang isotop paling stabilnya telah diidentifikasi dengan pasti, fransium merupakan yang paling tidak stabil. Semua unsur dengan nomor atom 106 (seaborgium) atau lebih besar memiliki isotop paling stabil yang diketahui lebih pendek daripada fransium, tetapi karena unsur-unsur tersebut hanya memiliki jumlah isotop yang relatif kecil yang ditemukan, kemungkinan tetap bahwa isotop yang belum ditemukan dari unsur-unsur tersebut mungkin memiliki waktu paruh lebih lama.
Daftar isotop
Nuklida [n 1] | Nama historis | Z | N | Massa isotop (Da) [n 2][n 3] | Waktu paruh [n 4] | Mode peluruhan [n 5] | Isotop anak | Spin dan paritas [n 6][n 4] | Kelimpahan isotop | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Energi eksitasi[n 4] | |||||||||||||||||||
199Fr | 87 | 112 | 199,00726(4) | 16(7) mdtk | 1/2+# | ||||||||||||||
200Fr | 87 | 113 | 200,00657(8) | 24(10) mdtk | α | 196At | 3+# | ||||||||||||
200mFr | 60(110) keV | 650(210) mdtk | α | 196At | 10−# | ||||||||||||||
IT (langka) | 200Fr | ||||||||||||||||||
201Fr | 87 | 114 | 201,00386(8) | 67(3) mdtk | α (99%) | 197At | (9/2−) | ||||||||||||
β+ (1%) | 201Rn | ||||||||||||||||||
202Fr | 87 | 115 | 202,00337(5) | 290(30) mdtk | α (97%) | 198At | (3+) | ||||||||||||
β+ (3%) | 202Rn | ||||||||||||||||||
202mFr | 330(90)# keV | 340(40) mdtk | α (97%) | 198At | (10−) | ||||||||||||||
β+ (3%) | 202Rn | ||||||||||||||||||
203Fr | 87 | 116 | 203,000925(17) | 0,55(2) dtk | α (95%) | 199At | (9/2−)# | ||||||||||||
β+ (5%) | 203Rn | ||||||||||||||||||
204Fr | 87 | 117 | 204,000653(26) | 1,7(3) dtk | α (96%) | 200At | (3+) | ||||||||||||
β+ (4%) | 204Rn | ||||||||||||||||||
204m1Fr | 50(4) keV | 2,6(3) dtk | α (90%) | 200At | (7+) | ||||||||||||||
β+ (10%) | 204Rn | ||||||||||||||||||
204m2Fr | 326(4) keV | 1,7(6) dtk | (10−) | ||||||||||||||||
205Fr | 87 | 118 | 204,998594(8) | 3,80(3) dtk | α (99%) | 201At | (9/2−) | ||||||||||||
β+ (1%) | 205Rn | ||||||||||||||||||
206Fr | 87 | 119 | 205,99867(3) | ~16 dtk | β+ (58%) | 206Rn | (2+, 3+) | ||||||||||||
α (42%) | 202At | ||||||||||||||||||
206m1Fr | 190(40) keV | 15,9(1) dtk | (7+) | ||||||||||||||||
206m2Fr | 730(40) keV | 700(100) mdtk | (10−) | ||||||||||||||||
207Fr | 87 | 120 | 206,99695(5) | 14,8(1) dtk | α (95%) | 203At | 9/2− | ||||||||||||
β+ (5%) | 207Rn | ||||||||||||||||||
208Fr | 87 | 121 | 207,99714(5) | 59,1(3) dtk | α (90%) | 204At | 7+ | ||||||||||||
β+ (10%) | 208Rn | ||||||||||||||||||
209Fr | 87 | 122 | 208,995954(16) | 50,0(3) dtk | α (89%) | 205At | 9/2− | ||||||||||||
β+ (11%) | 209Rn | ||||||||||||||||||
210Fr | 87 | 123 | 209,996408(24) | 3,18(6) mnt | α (60%) | 206At | 6+ | ||||||||||||
β+ (40%) | 210Rn | ||||||||||||||||||
211Fr | 87 | 124 | 210,995537(23) | 3,10(2) mnt | α (80%) | 207At | 9/2− | ||||||||||||
β+ (20%) | 211Rn | ||||||||||||||||||
212Fr | 87 | 125 | 211,996202(28) | 20,0(6) mnt | β+ (57%) | 212Rn | 5+ | ||||||||||||
α (43%) | 208At | ||||||||||||||||||
213Fr | 87 | 126 | 212,996189(8) | 34,6(3) dtk | α (99,45%) | 209At | 9/2− | ||||||||||||
β+ (0,55%) | 213Rn | ||||||||||||||||||
214Fr | 87 | 127 | 213,998971(9) | 5,0(2) mdtk | α | 210At | (1−) | ||||||||||||
214m1Fr | 123(6) keV | 3,35(5) mdtk | α | 210At | (8−) | ||||||||||||||
214m2Fr | 638(6) keV | 103(4) ndtk | (11+) | ||||||||||||||||
214m3Fr | 6477+Y keV | 108(7) ndtk | (33+) | ||||||||||||||||
215Fr | 87 | 128 | 215,000341(8) | 86(5) ndtk | α | 211At | 9/2− | ||||||||||||
216Fr | 87 | 129 | 216,003198(15) | 0,70(2) μdtk | α | 212At | (1−) | ||||||||||||
β+ (2×10−7%) | 216Rn | ||||||||||||||||||
217Fr | 87 | 130 | 217,004632(7) | 16,8(19) μdtk | α | 213At | 9/2− | ||||||||||||
218Fr | 87 | 131 | 218,007578(5) | 1,0(6) mdtk | α | 214At | 1− | ||||||||||||
218m1Fr | 86(4) keV | 22,0(5) mdtk | α | 214At | |||||||||||||||
IT (langka) | 218Fr | ||||||||||||||||||
218m2Fr | 200(150)# keV | tinggi | |||||||||||||||||
219Fr | 87 | 132 | 219,009252(8) | 20(2) mdtk | α | 215At | 9/2− | ||||||||||||
220Fr | 87 | 133 | 220,012327(4) | 27,4(3) dtk | α (99,65%) | 216At | 1+ | ||||||||||||
β− (0,35%) | 220Ra | ||||||||||||||||||
221Fr | 87 | 134 | 221,014255(5) | 4,9(2) mnt | α (99,9%) | 217At | 5/2− | Renik[n 7] | |||||||||||
β− (0,1%) | 221Ra | ||||||||||||||||||
CD (8,79×10−11%) | 207Tl 14C | ||||||||||||||||||
222Fr | 87 | 135 | 222,017552(23) | 14,2(3) mnt | β− | 222Ra | 2− | ||||||||||||
223Fr | Aktinium K | 87 | 136 | 223,0197359(26) | 22,00(7) mnt | β− (99,99%) | 223Ra | 3/2(−) | Renik[n 8] | ||||||||||
α (0,006%) | 219At | ||||||||||||||||||
224Fr | 87 | 137 | 224,02325(5) | 3,33(10) mnt | β− | 224Ra | 1− | ||||||||||||
225Fr | 87 | 138 | 225,02557(3) | 4,0(2) mnt | β− | 225Ra | 3/2− | ||||||||||||
226Fr | 87 | 139 | 226,02939(11) | 49(1) dtk | β− | 226Ra | 1− | ||||||||||||
227Fr | 87 | 140 | 227,03184(11) | 2,47(3) mnt | β− | 227Ra | 1/2+ | ||||||||||||
228Fr | 87 | 141 | 228,03573(22)# | 38(1) dtk | β− | 228Ra | 2− | ||||||||||||
229Fr | 87 | 142 | 229,03845(4) | 50,2(4) dtk | β− | 229Ra | (1/2+)# | ||||||||||||
230Fr | 87 | 143 | 230,04251(48)# | 19,1(5) dtk | β− | 230Ra | |||||||||||||
231Fr | 87 | 144 | 231,04544(50)# | 17,6(6) dtk | β− | 231Ra | (1/2+)# | ||||||||||||
232Fr | 87 | 145 | 232,04977(69)# | 5(1) dtk | β− | 232Ra | |||||||||||||
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Referensi
- Massa isotop dari:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- Komposisi isotop dan massa atom standar dari:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683
.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051
.
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683
- "News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 Oktober 2005.
- Data waktu paruh, spin, dan isomer dipilih dari sumber-sumber berikut.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Laboratorium Nasional Brookhaven.
- Holden, Norman E. (2004). "11. Table of the Isotopes". Dalam Lide, David R. CRC Handbook of Chemistry and Physics (edisi ke-85). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
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