Copernicium (Z = 112, A = 277–285)

²⁷⁷Cn — Unstable · t½ ≈ 0.7 ms · Decay: α → ²⁷³Ds · Type: synthetic · Uses: research.
²⁷⁸Cn — Unstable · t½ ≈ 0.9 ms · Decay: α → ²⁷⁴Ds · Type: synthetic · Uses: research.
²⁷⁹Cn — Unstable · t½ ≈ 0.2 ms · Decay: α → ²⁷⁵Ds · Type: synthetic · Uses: research.
²⁸⁰Cn — Unstable · t½ ≈ 0.9 ms · Decay: α → ²⁷⁶Ds · Type: synthetic · Uses: research.
²⁸¹Cn — Unstable · t½ ≈ 0.9 ms · Decay: α → ²⁷⁷Ds · Type: synthetic · Uses: research.
²⁸²Cn — Unstable · t½ ≈ 0.8 ms · Decay: α → ²⁷⁸Ds · Type: synthetic · Uses: research.
²⁸³Cn — Unstable · t½ ≈ 4.0 s · Decay: α → ²⁷⁹Ds · Type: synthetic · Uses: research.
²⁸⁴Cn — Unstable · t½ ≈ 0.1 s · Decay: α → ²⁸⁰Ds · Type: synthetic · Uses: research.
²⁸⁵Cn — Unstable · t½ ≈ 29.0 s · Decay: α → ²⁸¹Ds · Type: synthetic · Uses: longest-lived Cn isotope, nuclear chemistry studies.

Copernicium — isotope count: 9 total · Stable: none · Unstable: 9.
(Data: IAEA LiveChart, NUBASE2020, ENSDF, Wikipedia “Isotopes of copernicium.” Notable applications: all isotopes are synthetic; ²⁸³Cn and ²⁸⁵Cn provide the longest half-lives, enabling rare chemical experiments with copernicium.)

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