²⁵⁸Sg — Unstable · t½ ≈ 2.9 ms · Decay: α → ²⁵⁴Rf · Type: synthetic · Uses: research.
²⁵⁹Sg — Unstable · t½ ≈ 0.9 ms · Decay: α → ²⁵⁵Rf · Type: synthetic · Uses: research.
²⁶⁰Sg — Unstable · t½ ≈ 4.0 ms · Decay: α → ²⁵⁶Rf · Type: synthetic · Uses: research.
²⁶¹Sg — Unstable · t½ ≈ 0.2 s · Decay: α → ²⁵⁷Rf · Type: synthetic · Uses: research.
²⁶²Sg — Unstable · t½ ≈ 0.7 s · Decay: α → ²⁵⁸Rf · Type: synthetic · Uses: research.
²⁶³Sg — Unstable · t½ ≈ 1.0 min · Decay: α → ²⁵⁹Rf · Type: synthetic · Uses: research.
²⁶⁴Sg — Unstable · t½ ≈ 37.0 s · Decay: α → ²⁶⁰Rf · Type: synthetic · Uses: research.
²⁶⁵Sg — Unstable · t½ ≈ 16.0 s · Decay: α → ²⁶¹Rf · Type: synthetic · Uses: research.
²⁶⁶Sg — Unstable · t½ ≈ 21.0 s · Decay: α → ²⁶²Rf · Type: synthetic · Uses: research.
²⁶⁷Sg — Unstable · t½ ≈ 1.4 min · Decay: α → ²⁶³Rf · Type: synthetic · Uses: research.
²⁶⁸Sg — Unstable · t½ ≈ 11.0 min · Decay: α → ²⁶⁴Rf · Type: synthetic · Uses: research.
²⁶⁹Sg — Unstable · t½ ≈ 1.9 min · Decay: α → ²⁶⁵Rf · Type: synthetic · Uses: research.
²⁷⁰Sg — Unstable · t½ ≈ 3.6 min · Decay: α → ²⁶⁶Rf · Type: synthetic · Uses: research.
²⁷¹Sg — Unstable · t½ ≈ 2.4 min · Decay: α → ²⁶⁷Rf · Type: synthetic · Uses: research.
Seaborgium — isotope count: 14 total · Stable: none · Unstable: 14.
(Data: IAEA LiveChart, NUBASE2020, ENSDF, Wikipedia “Isotopes of seaborgium.” Notable applications: all isotopes are short-lived, produced synthetically, and used only in superheavy element research.)