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nuklida dengan nomor atom 87 tetapi dengan nomor massa berbeda Dari Wikipedia, ensiklopedia bebas
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.
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.
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 | |||||||||||||
Header & footer tabel ini: |
CD: | Peluruhan gugus |
IT: | Transisi isomerik |
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