²⁶⁶Mt — Unstable · t½ ≈ 1.0 ms · Decay: α → ²⁶²Bh · Type: synthetic · Uses: research.
²⁶⁷Mt — Unstable · t½ ≈ 5.0 ms · Decay: α → ²⁶³Bh · Type: synthetic · Uses: research.
²⁶⁸Mt — Unstable · t½ ≈ 21.0 ms · Decay: α → ²⁶⁴Bh · Type: synthetic · Uses: research.
²⁶⁹Mt — Unstable · t½ ≈ 70.0 ms · Decay: α → ²⁶⁵Bh · Type: synthetic · Uses: research.
²⁷⁰Mt — Unstable · t½ ≈ 0.7 s · Decay: α → ²⁶⁶Bh · Type: synthetic · Uses: research.
²⁷¹Mt — Unstable · t½ ≈ 1.0 s · Decay: α → ²⁶⁷Bh · Type: synthetic · Uses: research.
²⁷²Mt — Unstable · t½ ≈ 1.6 s · Decay: α → ²⁶⁸Bh · Type: synthetic · Uses: research.
²⁷³Mt — Unstable · t½ ≈ 0.7 s · Decay: α → ²⁶⁹Bh · Type: synthetic · Uses: research.
²⁷⁴Mt — Unstable · t½ ≈ 0.4 s · Decay: α → ²⁷⁰Bh · Type: synthetic · Uses: research.
²⁷⁵Mt — Unstable · t½ ≈ 0.9 s · Decay: α → ²⁷¹Bh · Type: synthetic · Uses: research.
²⁷⁶Mt — Unstable · t½ ≈ 0.7 s · Decay: α → ²⁷²Bh · Type: synthetic · Uses: research.
²⁷⁷Mt — Unstable · t½ ≈ 0.6 s · Decay: α → ²⁷³Bh · Type: synthetic · Uses: research.
²⁷⁸Mt — Unstable · t½ ≈ 4.5 s · Decay: α → ²⁷⁴Bh · Type: synthetic · Uses: research.
Meitnerium — isotope count: 13 total · Stable: none · Unstable: 13.
(Data: IAEA LiveChart, NUBASE2020, ENSDF, Wikipedia “Isotopes of meitnerium.” Notable applications: all isotopes are synthetic, short-lived, studied only in nuclear physics labs; ²⁷⁸Mt is the longest-lived, allowing limited chemical investigations.)
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