Ta
Tantalum
Z 73 180.948 g/molTransition Metal
| 181Ta | 108 | 180.948 | -48,439.1 | 99.988% | Stable | 7/2+ | --- | 1932 |
| 180mTa | 107 | 179.9475 | -48,858.3 | 0.012% | Stable | 9- | β⁻→180W | 1940 |
| 155Ta | 82 | 154.9742 | -23,990.0 | --- | 3.2 ms | 11/2- | p→154Hf(100%) | 2007 |
| 156Ta | 83 | 155.9721 | -26,000.0 | --- | 106.0 ms | (2-) | p→155Hf(71%) β⁺→156Hf(29%) | 1992 |
| 156mTa | 83 | 155.9722 | -25,910.0 | --- | 360.0 ms | (9+) | β⁺→156Hf(95.8%) p→155Hf(4.2%) | 1993 |
| 157Ta | 84 | 156.9682 | -29,600.0 | --- | 10.1 ms | 1/2+ | α→153Lu(96.6%) p→156Hf(3.4%) β⁺→157Hf | 1979 |
| 157mTa | 84 | 156.9683 | -29,570.0 | --- | 4.3 ms | 11/2- | α→153Lu(100%) β⁺→157Hf | 1996 |
| 157nTa | 84 | 156.9699 | -28,000.0 | --- | 1.7 ms | (25/2-) | α→153Lu(100%) | 1996 |
| 158Ta | 85 | 157.9666 | -31,120.0 | --- | 49.0 ms | (2-) | α→154Lu(100%) β⁺→158Hf | 1979 |
| 158mTa | 85 | 157.9667 | -30,980.0 | --- | 36.0 ms | (9+) | α→154Lu(95%) β⁺→158Hf γ→158Ta | 1979 |
| 158nTa | 85 | 157.9696 | -28,310.0 | --- | 6.1 µs | (19-) | γ→158Ta(98.6%) α→154Lu(1.4%) | 2014 |
| 159Ta | 86 | 158.963 | -34,439.0 | --- | 1.04 s | 1/2+ | β⁺→159Hf(66%) α→155Lu(34%) | 1979 |
| 159mTa | 86 | 158.9631 | -34,375.0 | --- | 560.0 ms | 11/2- | α→155Lu(55%) β⁺→159Hf(45%) | 1994 |
| 160Ta | 87 | 159.9615 | -35,820.0 | --- | 1.7 s | (2-) | β⁺→160Hf α→156Lu | 1979 |
| 160mTa | 87 | 159.9617 | -35,710.0 | --- | 1.55 s | (9+) | β⁺→160Hf α→156Lu | 1979 |
| 161Ta | 88 | 160.9584 | -38,779.0 | --- | 3.0 s | (1/2+) | β⁺→161Hf α→157Lu | 1979 |
| 161mTa | 88 | 160.9584 | -38,717.0 | --- | 3.08 s | (11/2-) | β⁺→161Hf(93%) α→157Lu(7%) | 1979 |
| 162Ta | 89 | 161.9573 | -39,780.0 | --- | 3.57 s | (3-) | β⁺→162Hf(99.926%) α→158Lu(0.074%) | 1985 |
| 162mTa | 89 | 161.9574 | -39,660.0 | --- | 5.0 s | (7+) | β⁺→162Hf γ→162Ta α→158Lu | --- |
| 163Ta | 90 | 162.9543 | -42,530.0 | --- | 10.6 s | 1/2+ | β⁺→163Hf(100%) α→159Lu | 1985 |
| 163mTa | 90 | 162.9545 | -42,400.0 | --- | 10.0 s | 9/2- | β⁺→163Hf α→159Lu γ→163Ta | --- |
| 164Ta | 91 | 163.9535 | -43,283.0 | --- | 14.2 s | (3+) | β⁺→164Hf(100%) | 1982 |
| 165Ta | 92 | 164.9508 | -45,848.0 | --- | 31.0 s | (1/2+) | β⁺→165Hf(100%) | 1982 |
| 165mTa | 92 | 164.9508 | -45,823.0 | --- | 30.0 s | (9/2-) | β⁺→165Hf α→161Lu | --- |
| 166Ta | 93 | 165.9505 | -46,098.0 | --- | 34.4 s | (2+) | β⁺→166Hf(100%) | 1977 |
| 167Ta | 94 | 166.9481 | -48,351.0 | --- | 1.33 m | (3/2+) | β⁺→167Hf(100%) | 1982 |
| 168Ta | 95 | 167.948 | -48,394.0 | --- | 2.0 m | (3+) | β⁺→168Hf(100%) | 1969 |
| 169Ta | 96 | 168.946 | -50,290.0 | --- | 4.9 m | (5/2+) | β⁺→169Hf(100%) | 1969 |
| 170Ta | 97 | 169.9462 | -50,138.0 | --- | 6.76 m | (3+) | β⁺→170Hf(100%) | 1969 |
| 171Ta | 98 | 170.9445 | -51,720.0 | --- | 23.3 m | (5/2+) | β⁺→171Hf(100%) | 1969 |
| 172Ta | 99 | 171.9449 | -51,330.0 | --- | 36.8 m | (3+) | β⁺→172Hf(100%) | 1964 |
| 173Ta | 100 | 172.9437 | -52,397.0 | --- | 3.14 h | 5/2- | β⁺→173Hf(100%) | 1960 |
| 173mTa | 100 | 172.9439 | -52,224.0 | --- | 205.2 ns | 9/2- | γ→173Ta(100%) | 1977 |
| 173nTa | 100 | 172.9456 | -50,680.0 | --- | 132.0 ns | 21/2- | γ→173Ta(100%) | 2006 |
| 174Ta | 101 | 173.9445 | -51,741.0 | --- | 1.14 h | 3+ | β⁺→174Hf(100%) | 1960 |
| 175Ta | 102 | 174.9437 | -52,409.0 | --- | 10.5 h | 7/2+ | β⁺→175Hf(100%) | 1960 |
| 175mTa | 102 | 174.9439 | -52,278.0 | --- | 222.0 ns | 9/2- | γ→175Ta(100%) | 1972 |
| 175nTa | 102 | 174.9441 | -52,070.0 | --- | 170.0 ns | (1/2+) | γ→175Ta(100%) | 1969 |
| 176Ta | 103 | 175.9449 | -51,370.0 | --- | 8.09 h | (1-) | β⁺→176Hf(100%) | 1948 |
| 176mTa | 103 | 175.945 | -51,270.0 | --- | 1.08 ms | 7+ | γ→176Ta(100%) | 1971 |
| 176nTa | 103 | 175.9464 | -49,900.0 | --- | 3.8 µs | 14- | γ→176Ta(100%) | 1978 |
| 177Ta | 104 | 176.9445 | -51,715.0 | --- | 2.35 d | 7/2+ | β⁺→177Hf(100%) | 1948 |
| 177mTa | 104 | 176.9446 | -51,642.0 | --- | 410.0 ns | 9/2- | γ→177Ta(100%) | 1973 |
| 177nTa | 104 | 176.9447 | -51,529.0 | --- | 3.62 µs | 5/2- | γ→177Ta(100%) | 1971 |
| 178Ta | 105 | 177.9457 | -50,600.0 | --- | 2.36 h | 7- | β⁺→178Hf(100%) | 1950 |
| 178mTa | 105 | 177.9458 | -50,498.0 | --- | 9.31 m | (1+) | β⁺→178Hf(100%) | 1950 |
| 178nTa | 105 | 177.9473 | -49,130.0 | --- | 59.0 ms | 15- | γ→178Ta(100%) | 1979 |
| 179Ta | 106 | 178.9459 | -50,357.5 | --- | 1.82 y | 7/2+ | EC→179Hf(100%) | 1950 |
| 179mTa | 106 | 178.946 | -50,326.8 | --- | 1.42 µs | 9/2- | γ→179Ta(100%) | 1964 |
| 179nTa | 106 | 178.9465 | -49,837.3 | --- | 280.0 ns | 1/2+ | γ→179Ta(100%) | 1974 |
| 180Ta | 107 | 179.9475 | -48,933.6 | --- | 8.15 h | 1+ | EC→180Hf(85%) β⁻→180W(15%) | 1938 |
| 180nTa | 107 | 179.949 | -47,481.2 | --- | 31.2 µs | 15- | γ→180Ta(100%) | 1996 |
| 181mTa | 108 | 180.948 | -48,432.9 | --- | 6.05 µs | 9/2- | γ→181Ta(100%) | 1979 |
| 181nTa | 108 | 180.9487 | -47,823.9 | --- | 18.0 µs | 1/2+ | γ→181Ta(100%) | 1948 |
| 182Ta | 109 | 181.9502 | -46,430.7 | --- | 114.74 d | 3- | β⁻→182W(100%) | 1938 |
| 182mTa | 109 | 181.9502 | -46,414.4 | --- | 283.0 ms | 5+ | γ→182Ta(100%) | 1968 |
| 182nTa | 109 | 181.9507 | -45,911.1 | --- | 15.84 m | 10- | γ→182Ta(100%) | 1947 |
| 183Ta | 110 | 182.9514 | -45,293.5 | --- | 5.1 d | 7/2+ | β⁻→183W(100%) | 1950 |
| 183mTa | 110 | 182.9515 | -45,220.3 | --- | 106.0 ns | 9/2- | γ→183Ta(100%) | 1967 |
| 183nTa | 110 | 182.9528 | -43,959.0 | --- | 900.0 ns | (19/2+) | γ→183Ta(100%) | 2009 |
| 184Ta | 111 | 183.954 | -42,839.0 | --- | 8.7 h | (5-) | β⁻→184W(100%) | 1955 |
| 185Ta | 112 | 184.9556 | -41,394.0 | --- | 49.4 m | (7/2+) | β⁻→185W(100%) | 1950 |
| 185mTa | 112 | 184.956 | -40,988.0 | --- | 900.0 ns | (3/2+) | γ→185Ta(100%) | 2007 |
| 185nTa | 112 | 184.9569 | -40,121.0 | --- | 11.8 ms | 21/2- | γ→185Ta(100%) | 1999 |
| 186Ta | 113 | 185.9586 | -38,610.0 | --- | 10.5 m | (3) | β⁻→186W(100%) | 1955 |
| 186mTa | 113 | 185.9589 | -38,270.0 | --- | 1.54 m | (9+) | β⁻→186W γ→186Ta | 2010 |
| 187Ta | 114 | 186.9604 | -36,900.0 | --- | 2.3 m | (7/2+) | β⁻→187W(100%) | 1999 |
| 187mTa | 114 | 186.9623 | -35,110.0 | --- | 7.3 s | (25/2-) | γ→187Ta(100%) β⁻→187W | 2010 |
| 187nTa | 114 | 186.9635 | -33,970.0 | --- | --- | (41/2+) | β⁻→187W γ→187Ta | 2010 |
| 188Ta | 115 | 187.9636 | -33,910.0 | --- | 19.6 s | (1-) | β⁻→188W(100%) | 1999 |
| 188mTa | 115 | 187.9637 | -33,810.0 | --- | 19.6 s | (7-) | γ→188Ta β⁻→188W | 2005 |
| 188nTa | 115 | 187.964 | -33,520.0 | --- | 3.6 µs | (10+) | γ→188Ta(100%) | 2005 |
| 189Ta | 116 | 188.9657 | -31,960.0 | --- | 20.0 s | (7/2+) | β⁻→189W(100%) | 1999 |
| 189mTa | 116 | 188.9675 | -30,310.0 | --- | 1.6 µs | (21/2-) | γ→189Ta(100%) | 2009 |
| 190Ta | 117 | 189.9692 | -28,720.0 | --- | 5.3 s | (3) | β⁻→190W(100%) | 2009 |
| 191Ta | 118 | 190.9715 | -26,520.0 | --- | 460.0 ms | (7/2+) | β⁻→191W | 2009 |
| 192Ta | 119 | 191.9752 | -23,100.0 | --- | 2.2 s | (2) | β⁻→192W(100%) β⁻n→191W | 2009 |
| 193Ta | 120 | 192.9777 | -20,810.0 | --- | 220.0 ms | (7/2+) | β⁻→193W β⁻n→192W | 2012 |
| 194Ta | 121 | 193.9816 | -17,130.0 | --- | 2.0 s | --- | β⁻→194W β⁻n→193W | 2012 |