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| Isotopes of Seaborgium |
 Notes
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| There are 11 known isotopes of Seaborgium, the longest-lived isotope is 269Sg which decays through alpha decay and spontaneous fission. It has a half-llife of 22 seconds. |
| The shortest-lived isotope is 258Sg which also decays through alpha decay and spontaneous fission. It has a half-llife of 2.9 ms. |