²⁷²Rg — Unstable · t½ ≈ 1.5 ms · Decay: α → ²⁶⁸Mt · Type: synthetic · Uses: research.
²⁷³Rg — Unstable · t½ ≈ 2.0 ms · Decay: α → ²⁶⁹Mt · Type: synthetic · Uses: research.
²⁷⁴Rg — Unstable · t½ ≈ 6.0 ms · Decay: α → ²⁷⁰Mt · Type: synthetic · Uses: research.
²⁷⁵Rg — Unstable · t½ ≈ 4.0 ms · Decay: α → ²⁷¹Mt · Type: synthetic · Uses: research.
²⁷⁶Rg — Unstable · t½ ≈ 10.0 ms · Decay: α → ²⁷²Mt · Type: synthetic · Uses: research.
²⁷⁷Rg — Unstable · t½ ≈ 1.5 s · Decay: α → ²⁷³Mt · Type: synthetic · Uses: research.
²⁷⁸Rg — Unstable · t½ ≈ 4.2 s · Decay: α → ²⁷⁴Mt · Type: synthetic · Uses: research.
²⁷⁹Rg — Unstable · t½ ≈ 0.17 s · Decay: α → ²⁷⁵Mt · Type: synthetic · Uses: research.
²⁸⁰Rg — Unstable · t½ ≈ 3.6 s · Decay: α → ²⁷⁶Mt · Type: synthetic · Uses: research.
²⁸¹Rg — Unstable · t½ ≈ 26.0 s · Decay: α → ²⁷⁷Mt · Type: synthetic · Uses: research.
²⁸²Rg — Unstable · t½ ≈ 2.1 min · Decay: α → ²⁷⁸Mt · Type: synthetic · Uses: longest-lived Rg isotope, research.
Roentgenium — isotope count: 11 total · Stable: none · Unstable: 11.
(Data: IAEA LiveChart, NUBASE2020, ENSDF, Wikipedia “Isotopes of roentgenium.” Notable applications: all isotopes are synthetic, very short-lived; ²⁸²Rg is the longest-lived, allowing very limited chemical studies.)
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