| Symbol | Mass Number | Relative Atomic Mass | Isotopic Composition |
|---|---|---|---|
| 272Rg | 272 | 272.15362(36)# | |
| 273Rg | 273 | 273.15368(65)# | |
| 274Rg | 274 | 274.15571(66)# | |
| 275Rg | 275 | 275.15614(74)# | |
| 276Rg | 276 | 276.15849(67)# | |
| 277Rg | 277 | 277.15952(66)# | |
| 278Rg | 278 | 278.16160(68)# | |
| 279Rg | 279 | 279.16247(71)# | |
| 280Rg | 280 | 280.16447(80)# | |
| 281Rg | 281 | 281.16537(100)# | |
| 282Rg | 282 | 282.16749(95)# | |
| 283Rg | 283 | 283.16842(84)# |