Rg
Roentgenium
Z 111 282.0 g/molTransition Metal Radioactive
| 272Rg | 161 | 272.1533 | 142,770.0 | --- | 4.2 ms | --- | α→268Mt(100%) | 1995 |
| 273Rg | 162 | 273.1534 | 142,890.0 | --- | 2.0 ms | --- | α→269Mt | --- |
| 274Rg | 163 | 274.1552 | 144,610.0 | --- | 20.0 ms | --- | α→270Mt(100%) | 2004 |
| 275Rg | 164 | 275.1561 | 145,400.0 | --- | 5.0 ms | --- | α→271Mt | --- |
| 276Rg | 165 | 276.1582 | 147,390.0 | --- | 10.0 ms | --- | α→272Mt SF | --- |
| 277Rg | 166 | 277.1593 | 148,410.0 | --- | 4.0 ms | --- | α→273Mt SF | --- |
| 278Rg | 167 | 278.1616 | 150,520.0 | --- | 8.0 ms | --- | α→274Mt(100%) | 2007 |
| 279Rg | 168 | 279.1629 | 151,720.0 | --- | 170.0 ms | --- | α→275Mt(100%) | 2004 |
| 280Rg | 169 | 280.1652 | 153,890.0 | --- | 4.3 s | --- | α→276Mt(100%) | 2004 |
| 281Rg | 170 | 281.1668 | 155,330.0 | --- | 19.0 s | --- | SF(87%) α→277Mt(13%) | 2010 |
| 282Rg | 171 | 282.1693 | 157,740.0 | --- | 2.17 m | --- | α→278Mt(100%) | 2010 |
| 283Rg | 172 | 283.1711 | 159,380.0 | --- | 2.0 m | --- | α→279Mt SF | --- |
| 284Rg | 173 | 284.1739 | 161,970.0 | --- | 1.0 m | --- | α→280Mt SF | --- |
| 285Rg | 174 | 285.1758 | 163,730.0 | --- | 30.0 s | --- | α→281Mt SF | --- |
| 286Rg | 175 | 286.1788 | 166,510.0 | --- | 10.0 s | --- | α→282Mt(100%) SF | 2016 |