²⁴¹Fm — Unstable · t½ ≈ 0.7 ms · Decay: α → ²³⁷Cf · Type: synthetic · Uses: research.
²⁴²Fm — Unstable · t½ ≈ 2.5 ms · Decay: α → ²³⁸Cf · Type: synthetic · Uses: research.
²⁴³Fm — Unstable · t½ ≈ 3.0 s · Decay: α → ²³⁹Cf · Type: synthetic · Uses: research.
²⁴⁴Fm — Unstable · t½ ≈ 3.3 s · Decay: α → ²⁴⁰Cf · Type: synthetic · Uses: research.
²⁴⁵Fm — Unstable · t½ ≈ 4.2 s · Decay: α → ²⁴¹Cf · Type: synthetic · Uses: research.
²⁴⁶Fm — Unstable · t½ ≈ 1.1 s · Decay: α → ²⁴²Cf · Type: synthetic · Uses: research.
²⁴⁷Fm — Unstable · t½ ≈ 3.0 s · Decay: α → ²⁴³Cf · Type: synthetic · Uses: research.
²⁴⁸Fm — Unstable · t½ ≈ 36.0 s · Decay: α → ²⁴⁴Cf · Type: synthetic · Uses: research.
²⁴⁹Fm — Unstable · t½ ≈ 2.6 min · Decay: α → ²⁴⁵Cf · Type: synthetic · Uses: research.
²⁵⁰Fm — Unstable · t½ ≈ 30.0 min · Decay: α → ²⁴⁶Cf · Type: synthetic · Uses: research.
²⁵¹Fm — Unstable · t½ ≈ 5.3 h · Decay: α → ²⁴⁷Cf · Type: synthetic · Uses: research.
²⁵²Fm — Unstable · t½ ≈ 25.4 h · Decay: α → ²⁴⁸Cf · Type: synthetic · Uses: research.
²⁵³Fm — Unstable · t½ ≈ 3.0 d · Decay: α → ²⁴⁹Cf · Type: synthetic · Uses: research.
²⁵⁴Fm — Unstable · t½ ≈ 3.24 h · Decay: α → ²⁵⁰Cf · Type: synthetic · Uses: research.
²⁵⁵Fm — Unstable · t½ ≈ 20.1 h · Decay: α → ²⁵¹Cf · Type: synthetic · Uses: research.
²⁵⁶Fm — Unstable · t½ ≈ 2.6 h · Decay: α → ²⁵²Cf · Type: synthetic · Uses: research.
²⁵⁷Fm — Unstable · t½ ≈ 100.5 d · Decay: α → ²⁵³Cf · Type: synthetic · Uses: nuclear structure research.
²⁵⁸Fm — Unstable · t½ ≈ 370 μs · Decay: spontaneous fission (~100%) · Type: synthetic · Uses: nuclear fission studies.
²⁵⁹Fm — Unstable · t½ ≈ 1.5 s · Decay: α → ²⁵⁵Cf · Type: synthetic · Uses: research.
Fermium — isotope count: 19 total · Stable: none · Unstable: 19.
(Data: IAEA LiveChart, NUBASE2020, ENSDF, Wikipedia “Isotopes of fermium.” Notable applications: ²⁵⁷Fm in nuclear structure research, ²⁵⁸Fm unique for spontaneous fission.)
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