¹⁹⁹Fr — Unstable · t½ ≈ 12.0 ms · Decay: β⁺ → ¹⁹⁹Rn · Type: synthetic · Uses: research.
²⁰⁰Fr — Unstable · t½ ≈ 16.0 ms · Decay: β⁺ → ²⁰⁰Rn · Type: synthetic · Uses: research.
²⁰¹Fr — Unstable · t½ ≈ 30.0 ms · Decay: β⁺ → ²⁰¹Rn · Type: synthetic · Uses: research.
²⁰²Fr — Unstable · t½ ≈ 0.3 s · Decay: β⁺ → ²⁰²Rn · Type: synthetic · Uses: research.
²⁰³Fr — Unstable · t½ ≈ 0.5 s · Decay: β⁺ → ²⁰³Rn · Type: synthetic · Uses: research.
²⁰⁴Fr — Unstable · t½ ≈ 1.0 s · Decay: β⁺ → ²⁰⁴Rn · Type: synthetic · Uses: research.
²⁰⁵Fr — Unstable · t½ ≈ 3.0 s · Decay: β⁺ → ²⁰⁵Rn · Type: synthetic · Uses: research.
²⁰⁶Fr — Unstable · t½ ≈ 16.0 s · Decay: β⁺ → ²⁰⁶Rn · Type: synthetic · Uses: research.
²⁰⁷Fr — Unstable · t½ ≈ 14.0 s · Decay: β⁺ → ²⁰⁷Rn · Type: synthetic · Uses: research.
²⁰⁸Fr — Unstable · t½ ≈ 15.0 s · Decay: β⁺ → ²⁰⁸Rn · Type: synthetic · Uses: research.
²⁰⁹Fr — Unstable · t½ ≈ 50.0 s · Decay: β⁺ → ²⁰⁹Rn · Type: synthetic · Uses: research.
²¹⁰Fr — Unstable · t½ ≈ 3.2 min · Decay: β⁺ → ²¹⁰Rn · Type: synthetic · Uses: research.
²¹¹Fr — Unstable · t½ ≈ 3.1 min · Decay: β⁺ → ²¹¹Rn · Type: synthetic · Uses: research.
²¹²Fr — Unstable · t½ ≈ 19.3 min · Decay: β⁺ → ²¹²Rn · Type: synthetic · Uses: research.
²¹³Fr — Unstable · t½ ≈ 34.0 s · Decay: β⁺ → ²¹³Rn · Type: synthetic · Uses: research.
²¹⁴Fr — Unstable · t½ ≈ 5.0 ms · Decay: α → ²¹⁰At · Type: synthetic · Uses: research.
²¹⁵Fr — Unstable · t½ ≈ 90.0 ms · Decay: α → ²¹¹At · Type: synthetic · Uses: research.
²¹⁶Fr — Unstable · t½ ≈ 0.7 s · Decay: α → ²¹²At · Type: synthetic · Uses: research.
²¹⁷Fr — Unstable · t½ ≈ 1.5 ms · Decay: α → ²¹³At · Type: synthetic · Uses: research.
²¹⁸Fr — Unstable · t½ ≈ 1.0 ms · Decay: α → ²¹⁴At · Type: synthetic · Uses: research.
²¹⁹Fr — Unstable · t½ ≈ 20.0 ms · Decay: α → ²¹⁵At · Type: synthetic · Uses: research.
²²⁰Fr — Unstable · t½ ≈ 27.4 s · Decay: α → ²¹⁶At · Type: synthetic · Uses: research.
²²¹Fr — Unstable · t½ ≈ 4.8 min · Decay: α → ²¹⁷At · Type: synthetic · Uses: research.
²²²Fr — Unstable · t½ ≈ 14.0 min · Decay: α → ²¹⁸At · Type: synthetic · Uses: research.
²²³Fr — Unstable · t½ ≈ 22.0 min · Decay: α → ²¹⁹At · Type: synthetic · Uses: research.
²²⁴Fr — Unstable · t½ ≈ 3.3 min · Decay: α → ²²⁰At · Type: synthetic · Uses: research.
²²⁵Fr — Unstable · t½ ≈ 4.0 min · Decay: α → ²²¹At · Type: synthetic · Uses: research.
²²⁶Fr — Unstable · t½ ≈ 49.0 s · Decay: α → ²²²At · Type: synthetic · Uses: research.
²²⁷Fr — Unstable · t½ ≈ 2.5 min · Decay: α → ²²³At · Type: synthetic · Uses: research.
²²⁸Fr — Unstable · t½ ≈ 38.0 s · Decay: α → ²²⁴At · Type: synthetic · Uses: research.
²²⁹Fr — Unstable · t½ ≈ 50.0 s · Decay: α → ²²⁵At · Type: synthetic · Uses: research.
²³⁰Fr — Unstable · t½ ≈ 19.0 s · Decay: α → ²²⁶At · Type: synthetic · Uses: research.
²³¹Fr — Unstable · t½ ≈ 17.5 s · Decay: α → ²²⁷At · Type: synthetic · Uses: research.
²³²Fr — Unstable · t½ ≈ 5.0 s · Decay: α → ²²⁸At · Type: synthetic · Uses: research.
²³³Fr — Unstable · t½ ≈ 2.0 s · Decay: α → ²²⁹At · Type: synthetic · Uses: research.
Francium — isotope count: 35 total · Stable: none · Unstable: 35.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ²¹¹Fr used in laser spectroscopy of atomic structure, others limited to nuclear structure research.)
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