in choosing which isotopes to search.
| Isotope | Relative Atomic Mass |
Isotopic Composition |
Standard Atomic Weight |
Notes | ||||
|---|---|---|---|---|---|---|---|---|
 | ||||||||
| 14 | Si | 28 | 27.976 926 5325(19) | 0.922 23(19) | 28.0855(3) | r | ||
| 29 | 28.976 494 700(22) | 0.046 85(8) | ||||||
| 30 | 29.973 770 17(3) | 0.030 92(11) | ||||||
| 34 | Se | 74 | 73.922 4764(18) | 0.0089(4) | 78.96(3) | |||
| 76 | 75.919 2136(18) | 0.0937(29) | ||||||
| 77 | 76.919 9140(18) | 0.0763(16) | ||||||
| 78 | 77.917 3091(18) | 0.2377(28) | ||||||
| 80 | 79.916 5213(21) | 0.4961(41) | ||||||
| 82 | 81.916 6994(22) | 0.0873(22) | ||||||
| ||||||||
