Mt
Meitnerium
Z 109 279.0 g/molTransition Metal Radioactive
| 265Mt | 156 | 265.1359 | 126,620.0 | --- | 2.0 ms | --- | α→261Bh | --- |
| 266Mt | 157 | 266.1371 | 127,670.0 | --- | 2.0 ms | --- | α→262Bh(100%) SF | 1982 |
| 266mMt | 157 | 266.1383 | 128,810.0 | --- | 6.0 ms | --- | α→262Bh(100%) | 1984 |
| 267Mt | 158 | 267.1372 | 127,790.0 | --- | 10.0 ms | --- | α→263Bh | --- |
| 268Mt | 159 | 268.1386 | 129,150.0 | --- | 23.0 ms | --- | α→264Bh(100%) | 1995 |
| 269Mt | 160 | 269.1388 | 129,300.0 | --- | 100.0 ms | --- | α→265Bh | --- |
| 270Mt | 161 | 270.1403 | 130,710.0 | --- | 800.0 ms | --- | α→266Bh(100%) | 2004 |
| 271Mt | 162 | 271.1407 | 131,100.0 | --- | 400.0 ms | --- | α→267Bh | --- |
| 272Mt | 163 | 272.1433 | 133,480.0 | --- | 400.0 ms | --- | α→268Bh SF | --- |
| 273Mt | 164 | 273.1447 | 134,780.0 | --- | 800.0 ms | --- | α→269Bh SF | --- |
| 274Mt | 165 | 274.1473 | 137,250.0 | --- | 850.0 ms | --- | α→270Bh(100%) | 2007 |
| 275Mt | 166 | 275.149 | 138,770.0 | --- | 31.0 ms | --- | α→271Bh(100%) | 2004 |
| 276Mt | 167 | 276.1517 | 141,310.0 | --- | 700.0 ms | --- | α→272Bh(100%) | 2004 |
| 276mMt | 167 | 276.152 | 141,560.0 | --- | 7.0 s | --- | α→272Bh(100%) | 2012 |
| 277Mt | 168 | 277.1535 | 143,010.0 | --- | 9.0 s | --- | SF(100%) α→273Bh | 2013 |
| 278Mt | 169 | 278.1565 | 145,770.0 | --- | 6.0 s | --- | α→274Bh(100%) | 2010 |
| 279Mt | 170 | 279.1584 | 147,590.0 | --- | 20.0 s | --- | α→275Bh SF | --- |
| 280Mt | 171 | 280.1616 | 150,510.0 | --- | 10.0 s | --- | α→276Bh SF | --- |
| 281Mt | 172 | 281.1636 | 152,400.0 | --- | 1.0 s | --- | α→277Bh SF | --- |
| 282Mt | 173 | 282.1669 | 155,460.0 | --- | 100.0 ms | --- | α→278Bh(100%) SF | 2016 |