Ra
Radium
Z 88 226.0 g/molAlkaline Earth Metal Radioactive
| 201Ra | 113 | 201.0128 | 11,937.0 | --- | 20.0 ms | (3/2-) | α→197Rn(100%) | 2005 |
| 201mRa | 113 | 201.0131 | 12,200.0 | --- | 6.0 ms | 13/2+ | α→197Rn(100%) | 2005 |
| 202Ra | 114 | 202.0097 | 9,075.0 | --- | 4.1 ms | 0+ | α→198Rn(100%) | 2005 |
| 203Ra | 115 | 203.0092 | 8,601.0 | --- | 36.0 ms | 3/2- | α→199Rn(100%) β⁺→203Fr | 1996 |
| 203mRa | 115 | 203.0095 | 8,848.0 | --- | 25.0 ms | 13/2+ | α→199Rn(100%) β⁺→203Fr | 1996 |
| 204Ra | 116 | 204.0065 | 6,061.0 | --- | 60.0 ms | 0+ | α→200Rn(100%) β⁺→204Fr | 1995 |
| 205Ra | 117 | 205.0062 | 5,804.0 | --- | 220.0 ms | 3/2- | α→201Rn(100%) β⁺→205Fr | 1987 |
| 205mRa | 117 | 205.0065 | 6,067.0 | --- | 180.0 ms | 13/2+ | α→201Rn(100%) γ→205Ra β⁺→205Fr | 1995 |
| 206Ra | 118 | 206.0038 | 3,566.0 | --- | 240.0 ms | 0+ | α→202Rn(100%) β⁺→206Fr | 1967 |
| 207Ra | 119 | 207.0038 | 3,510.0 | --- | 1.38 s | (5/2-) | α→203Rn(86%) β⁺→207Fr | 1967 |
| 207mRa | 119 | 207.0044 | 4,071.0 | --- | 57.0 ms | 13/2+ | γ→207Ra(85%) α→203Rn β⁺→207Fr | 1987 |
| 208Ra | 120 | 208.0019 | 1,728.0 | --- | 1.11 s | 0+ | α→204Rn(87%) β⁺→208Fr | 1967 |
| 208mRa | 120 | 208.0042 | 3,875.0 | --- | 263.0 ns | (8+) | γ→208Ra(100%) | 1998 |
| 209Ra | 121 | 209.002 | 1,858.0 | --- | 4.71 s | 5/2- | α→205Rn(100%) β⁺→209Fr | 1967 |
| 209mRa | 121 | 209.0029 | 2,740.0 | --- | 117.0 µs | 13/2+ | α→205Rn(90%) β⁺→209Fr(10%) | 2008 |
| 210Ra | 122 | 210.0005 | 443.0 | --- | 4.0 s | 0+ | α→206Rn(100%) β⁺→210Fr | 1967 |
| 210mRa | 122 | 210.0027 | 2,494.0 | --- | 2.29 µs | 8+ | γ→210Ra(100%) | 1998 |
| 211Ra | 123 | 211.0009 | 832.0 | --- | 12.6 s | 5/2- | α→207Rn(100%) β⁺→211Fr | 1967 |
| 211mRa | 123 | 211.0022 | 2,030.0 | --- | 9.5 µs | 13/2+ | γ→211Ra(100%) | 2004 |
| 212Ra | 124 | 211.9998 | -199.0 | --- | 13.0 s | 0+ | α→208Rn β⁺→212Fr | 1967 |
| 212mRa | 124 | 212.0019 | 1,759.0 | --- | 9.3 µs | 8+ | γ→212Ra(100%) | 1986 |
| 212nRa | 124 | 212.0026 | 2,414.0 | --- | 850.0 ns | 11- | γ→212Ra(100%) | 1986 |
| 213Ra | 125 | 213.0004 | 346.0 | --- | 2.73 m | 1/2- | α→209Rn(87%) β⁺→213Fr(13%) | 1955 |
| 213mRa | 125 | 213.0023 | 2,114.0 | --- | 2.2 ms | (17/2-) | γ→213Ra(99%) α→209Rn(0.6%) | 1976 |
| 214Ra | 126 | 214.0001 | 93.0 | --- | 2.44 s | 0+ | α→210Rn(99.941%) β⁺→214Fr(0.059%) | 1967 |
| 214mRa | 126 | 214.0021 | 1,913.0 | --- | 118.0 ns | 6+ | γ→214Ra(100%) | 2004 |
| 214nRa | 126 | 214.0021 | 1,958.0 | --- | 67.3 µs | 8+ | γ→214Ra(99.91%) α→210Rn(0.09%) | 1971 |
| 215Ra | 127 | 215.0027 | 2,532.0 | --- | 1.67 ms | (9/2+) | α→211Rn(100%) | 1967 |
| 215mRa | 127 | 215.0047 | 4,410.0 | --- | 7.31 µs | (25/2+) | γ→215Ra(100%) | 1983 |
| 215nRa | 127 | 215.0051 | 4,779.0 | --- | 1.39 µs | (29/2-) | γ→215Ra(100%) | 1998 |
| 216Ra | 128 | 216.0035 | 3,291.0 | --- | 172.0 ns | 0+ | α→212Rn(~100%) EC→216Fr(<1e-8%) | 1972 |
| 217Ra | 129 | 217.0063 | 5,890.0 | --- | 1.95 µs | (9/2+) | α→213Rn(100%) | 1970 |
| 218Ra | 130 | 218.0071 | 6,646.0 | --- | 25.91 µs | 0+ | α→214Rn(100%) | 1970 |
| 219Ra | 131 | 219.0101 | 9,394.0 | --- | 9.0 ms | (7/2+) | α→215Rn(100%) | 1952 |
| 219mRa | 131 | 219.0101 | 9,411.0 | --- | 10.0 ms | (11/2+) | α→215Rn(100%) γ→219Ra | 2018 |
| 220Ra | 132 | 220.011 | 10,272.0 | --- | 18.1 ms | 0+ | α→216Rn(100%) | 1949 |
| 221Ra | 133 | 221.0139 | 12,964.0 | --- | 25.0 s | 5/2+ | α→217Rn(~100%) CD→207Pb(1.2e-10%) | 1949 |
| 222Ra | 134 | 222.0154 | 14,320.0 | --- | 33.6 s | 0+ | α→218Rn(~100%) CD→208Pb(3e-8%) | 1948 |
| 223Ra | 135 | 223.0185 | 17,233.2 | --- | 11.44 d | 3/2+ | α→219Rn(~100%) CD→209Pb(8.9e-8%) | 1905 |
| 224Ra | 136 | 224.0202 | 18,825.8 | --- | 3.63 d | 0+ | α→220Rn(~100%) CD→210Pb(4e-9%) | 1902 |
| 225Ra | 137 | 225.0236 | 21,993.0 | --- | 14.82 d | 1/2+ | β⁻→225Ac(100%) | 1947 |
| 226Ra | 138 | 226.0254 | 23,667.6 | --- | 1.6 ky | 0+ | α→222Rn(~100%) CD→212Pb(2.6e-9%) β⁻ | 1898 |
| 227Ra | 139 | 227.0292 | 27,177.5 | --- | 42.2 m | 3/2+ | β⁻→227Ac(100%) | 1953 |
| 228Ra | 140 | 228.0311 | 28,940.2 | --- | 5.75 y | 0+ | β⁻→228Ac(100%) | 1907 |
| 229Ra | 141 | 229.035 | 32,562.0 | --- | 4.0 m | 5/2+ | β⁻→229Ac(100%) | 1975 |
| 230Ra | 142 | 230.0371 | 34,516.0 | --- | 1.55 h | 0+ | β⁻→230Ac(100%) | 1978 |
| 231Ra | 143 | 231.041 | 38,216.0 | --- | 1.73 m | (5/2+) | β⁻→231Ac(100%) | 1983 |
| 231mRa | 143 | 231.0411 | 38,282.0 | --- | --- | (1/2+) | γ→231Ra(100%) | 2001 |
| 232Ra | 144 | 232.0435 | 40,497.0 | --- | 4.0 m | 0+ | β⁻→232Ac(100%) | 1983 |
| 233Ra | 145 | 233.0476 | 44,334.0 | --- | 30.0 s | (1/2+) | β⁻→233Ac(100%) | 1990 |
| 234Ra | 146 | 234.0504 | 46,931.0 | --- | 30.0 s | 0+ | β⁻→234Ac(100%) β⁻SF | 1990 |
| 235Ra | 147 | 235.0549 | 51,130.0 | --- | 5.0 s | (5/2+) | β⁻→235Ac | --- |