| Isotope | Relative Atomic Mass |
Isotopic Composition |
Standard Atomic Weight |
Notes | ||||
|---|---|---|---|---|---|---|---|---|
 | ||||||||
| 34 | Se | 74 | 73.922 475 934(15) | 0.0089(4) | 78.971(8) | r | ||
| 76 | 75.919 213 704(17) | 0.0937(29) | ||||||
| 77 | 76.919 914 154(67) | 0.0763(16) | ||||||
| 78 | 77.917 309 28(20) | 0.2377(28) | ||||||
| 80 | 79.916 5218(13) | 0.4961(41) | ||||||
| 82 | 81.916 6995(15) | 0.0873(22) | ||||||
| ||||||||
