Fr
Francium
Z 87 223.0 g/molAlkali Metal Radioactive
| 197Fr | 110 | 197.011 | 10,250.0 | --- | 2.3 ms | (7/2-) | α→193At(100%) | 2013 |
| 198Fr | 111 | 198.0103 | 9,580.0 | --- | 15.0 ms | (3+) | α→194At(100%) | 2013 |
| 198mFr | 111 | 198.0103 | 9,580.0 | --- | 1.1 ms | (10-) | α→194At(100%) | 2013 |
| 199Fr | 112 | 199.0073 | 6,771.0 | --- | 6.6 ms | (1/2+) | α→195At(100%) β⁺→199Rn | 1999 |
| 199mFr | 112 | 199.0073 | 6,817.0 | --- | 6.5 ms | (7/2-) | α→195At(100%) β⁺→199Rn | 2013 |
| 199nFr | 112 | 199.0075 | 7,020.0 | --- | 2.2 ms | (13/2+) | α→195At(100%) β⁺→199Rn | 2013 |
| 200Fr | 113 | 200.0066 | 6,130.0 | --- | 47.5 ms | (3+) | α→196At(100%) β⁺→200Rn β⁺SF | 1995 |
| 200mFr | 113 | 200.0066 | 6,180.0 | --- | 190.0 ms | (10-) | α→196At(100%) γ→200Fr | 1996 |
| 200nFr | 113 | 200.0067 | 6,280.0 | --- | 790.0 ns | --- | γ→200Fr | 2014 |
| 201Fr | 114 | 201.0039 | 3,589.0 | --- | 62.8 ms | 9/2- | α→197At(100%) β⁺→201Rn | 1980 |
| 201mFr | 114 | 201.004 | 3,718.0 | --- | 24.0 ms | 1/2+ | α→197At(100%) | 2005 |
| 201nFr | 114 | 201.0042 | 3,879.0 | --- | 720.0 ns | 13/2+ | γ→201Fr(100%) | 2014 |
| 202Fr | 115 | 202.0033 | 3,102.0 | --- | 372.0 ms | 3+ | α→198At(100%) β⁺→202Rn | 1980 |
| 202mFr | 115 | 202.0036 | 3,359.0 | --- | 286.0 ms | 10- | α→198At(100%) γ→202Fr β⁺→202Rn | 1980 |
| 203Fr | 116 | 203.0009 | 876.0 | --- | 550.0 ms | 9/2- | α→199At(100%) β⁺→203Rn | 1967 |
| 203mFr | 116 | 203.0013 | 1,237.0 | --- | 43.0 ms | 1/2+ | γ→203Fr(80%) α→199At(20%) | 2013 |
| 203nFr | 116 | 203.0014 | 1,302.0 | --- | 370.0 ns | 13/2+ | γ→203Fr(100%) | 2013 |
| 204Fr | 117 | 204.0007 | 607.0 | --- | 1.75 s | 3+ | α→200At(96%) β⁺→204Rn | 1964 |
| 204mFr | 117 | 204.0007 | 658.0 | --- | 2.41 s | 7+ | α→200At(90%) β⁺→204Rn | 1967 |
| 204nFr | 117 | 204.001 | 934.0 | --- | 1.65 s | 10- | α→200At(53%) γ→204Fr(47%) | 1992 |
| 205Fr | 118 | 204.9986 | -1,310.0 | --- | 3.9 s | 9/2- | α→201At(98.5%) β⁺→205Rn(1.5%) | 1964 |
| 205mFr | 118 | 204.9992 | -766.0 | --- | 80.0 ns | 13/2+ | γ→205Fr(100%) | 2012 |
| 205nFr | 118 | 204.9992 | -701.0 | --- | 1.15 ms | (1/2+) | γ→205Fr(100%) | 2012 |
| 206Fr | 119 | 205.9987 | -1,247.0 | --- | --- | 3+ | α→202At(88.4%) β⁺→206Rn(11.6%) | 1964 |
| 206mFr | 119 | 205.9989 | -1,048.0 | --- | --- | 7+ | α→202At(84.7%) β⁺→206Rn γ→206Fr | 1964 |
| 206nFr | 119 | 205.9994 | -517.0 | --- | 700.0 ms | 10- | α→202At(13%) γ→206Fr | 1983 |
| 207Fr | 120 | 206.9969 | -2,849.0 | --- | 14.8 s | 9/2- | α→203At(95%) β⁺→207Rn | 1964 |
| 208Fr | 121 | 207.9971 | -2,665.0 | --- | 59.1 s | 7+ | α→204At(89%) β⁺→208Rn(11%) | 1964 |
| 208mFr | 121 | 207.998 | -1,839.0 | --- | 432.0 ns | 10- | γ→208Fr(100%) | 2009 |
| 209Fr | 122 | 208.9959 | -3,782.0 | --- | 50.5 s | 9/2- | α→205At(89%) β⁺→209Rn(11%) | 1964 |
| 209mFr | 122 | 209.0009 | 878.0 | --- | 420.0 ns | 45/2- | γ→209Fr(100%) | 2006 |
| 210Fr | 123 | 209.9964 | -3,344.0 | --- | 3.18 m | 6+ | α→206At(71%) β⁺→210Rn | 1964 |
| 210mFr | 123 | 210.0012 | 1,073.0 | --- | 475.0 ns | (23+) | γ→210Fr(100%) | 2016 |
| 211Fr | 124 | 210.9956 | -4,140.0 | --- | 3.1 m | 9/2- | α→207At(87%) β⁺→211Rn(13%) | 1964 |
| 211mFr | 124 | 210.9982 | -1,717.0 | --- | 146.0 ns | 29/2+ | γ→211Fr(100%) | 1986 |
| 211nFr | 124 | 211.0006 | 517.0 | --- | 124.5 ns | 45/2- | γ→211Fr(100%) | 1986 |
| 212Fr | 125 | 211.9962 | -3,516.0 | --- | 20.0 m | 5+ | β⁺→212Rn(57%) α→208At(43%) | 1950 |
| 212mFr | 125 | 211.9979 | -1,965.0 | --- | 31.9 µs | 11+ | γ→212Fr(100%) | 1977 |
| 212nFr | 125 | 211.9989 | -1,024.0 | --- | 604.0 ns | 15- | γ→212Fr(100%) | 1977 |
| 213Fr | 126 | 212.9962 | -3,554.0 | --- | 34.14 s | 9/2- | α→209At(99.44%) β⁺→213Rn(0.56%) | 1964 |
| 213mFr | 126 | 212.9979 | -1,964.0 | --- | 505.0 ns | 21/2- | γ→213Fr(100%) | 1971 |
| 213nFr | 126 | 212.9989 | -1,016.0 | --- | 238.0 ns | 29/2+ | γ→213Fr(100%) | 1971 |
| 214Fr | 127 | 213.999 | -958.0 | --- | 5.51 ms | (1-) | α→210At(100%) | 1967 |
| 214mFr | 127 | 213.9991 | -837.0 | --- | 3.35 ms | (8-) | α→210At(100%) | 1962 |
| 214nFr | 127 | 213.9997 | -320.0 | --- | 103.0 ns | (11+) | γ→214Fr(100%) | 1993 |
| 215Fr | 128 | 215.0003 | 318.0 | --- | 90.0 ns | 9/2- | α→211At(100%) | 1970 |
| 216Fr | 129 | 216.0032 | 2,971.0 | --- | 700.0 ns | (1-) | α→212At(100%) β⁺→216Rn | 1970 |
| 216mFr | 129 | 216.0034 | 3,190.0 | --- | 850.0 ns | (9-) | α→212At(100%) β⁺→216Rn | 2007 |
| 217Fr | 130 | 217.0046 | 4,315.0 | --- | 22.0 µs | 9/2- | α→213At(100%) | 1968 |
| 218Fr | 131 | 218.0076 | 7,059.0 | --- | 1.4 ms | 1- | α→214At(100%) | 1949 |
| 218mFr | 131 | 218.0077 | 7,147.0 | --- | 21.9 ms | (8-) | α→214At(100%) γ→218Fr | 1982 |
| 219Fr | 132 | 219.0093 | 8,617.0 | --- | 22.5 ms | 9/2- | α→215At(100%) | 1948 |
| 220Fr | 133 | 220.0123 | 11,482.0 | --- | 27.4 s | 1+ | α→216At(~100%) β⁻→220Ra(0.35%) | 1948 |
| 221Fr | 134 | 221.0143 | 13,277.0 | --- | 4.8 m | 5/2- | α→217At(~100%) β⁻→221Ra(0.005%) CD→207Tl(8.8e-11%) | 1947 |
| 222Fr | 135 | 222.0176 | 16,378.0 | --- | 14.2 m | 2- | β⁻→222Ra(100%) | 1975 |
| 223Fr | 136 | 223.0197 | 18,382.3 | --- | 22.0 m | 3/2- | β⁻→223Ra(~100%) α→219At(0.006%) | 1939 |
| 224Fr | 137 | 224.0233 | 21,749.0 | --- | 3.33 m | 1- | β⁻→224Ra(100%) | 1969 |
| 225Fr | 138 | 225.0256 | 23,821.0 | --- | 3.95 m | 3/2- | β⁻→225Ra(100%) | 1969 |
| 226Fr | 139 | 226.0295 | 27,521.0 | --- | 48.5 s | 1- | β⁻→226Ra(100%) | 1969 |
| 227Fr | 140 | 227.0319 | 29,682.0 | --- | 2.47 m | 1/2+ | β⁻→227Ra(100%) | 1972 |
| 228Fr | 141 | 228.0358 | 33,384.0 | --- | 38.0 s | 2- | β⁻→228Ra(100%) | 1972 |
| 228mFr | 141 | 228.0369 | 34,390.0 | --- | 3.0 m | --- | γ→228Fr β⁻→228Ra | 2008 |
| 229Fr | 142 | 229.0383 | 35,668.0 | --- | 50.2 s | (1/2+) | β⁻→229Ra(100%) | 1975 |
| 230Fr | 143 | 230.0424 | 39,487.0 | --- | 19.1 s | (2+) | β⁻→230Ra(100%) | 1987 |
| 231Fr | 144 | 231.0452 | 42,081.0 | --- | 17.6 s | (1/2+) | β⁻→231Ra(100%) | 1985 |
| 232Fr | 145 | 232.0495 | 46,073.0 | --- | 5.5 s | (5) | β⁻→232Ra(100%) β⁻SF | 1990 |
| 233Fr | 146 | 233.0525 | 48,920.0 | --- | 900.0 ms | (1/2+) | β⁻→233Ra(100%) β⁻n→232Ra | 2010 |