¹⁵⁵Ta — Unstable · t½ ≈ 1.7 s · Decay: β⁺ → ¹⁵⁵Hf · Type: synthetic · Uses: research.
¹⁵⁶Ta — Unstable · t½ ≈ 3.0 s · Decay: β⁺ → ¹⁵⁶Hf · Type: synthetic · Uses: research.
¹⁵⁷Ta — Unstable · t½ ≈ 3.5 s · Decay: β⁺ → ¹⁵⁷Hf · Type: synthetic · Uses: research.
¹⁵⁸Ta — Unstable · t½ ≈ 3.0 s · Decay: β⁺ → ¹⁵⁸Hf · Type: synthetic · Uses: research.
¹⁵⁹Ta — Unstable · t½ ≈ 4.0 s · Decay: β⁺ → ¹⁵⁹Hf · Type: synthetic · Uses: research.
¹⁶⁰Ta — Unstable · t½ ≈ 6.0 s · Decay: β⁺ → ¹⁶⁰Hf · Type: synthetic · Uses: research.
¹⁶¹Ta — Unstable · t½ ≈ 5.0 s · Decay: β⁺ → ¹⁶¹Hf · Type: synthetic · Uses: research.
¹⁶²Ta — Unstable · t½ ≈ 7.0 s · Decay: β⁺ → ¹⁶²Hf · Type: synthetic · Uses: research.
¹⁶³Ta — Unstable · t½ ≈ 11.0 s · Decay: β⁺ → ¹⁶³Hf · Type: synthetic · Uses: research.
¹⁶⁴Ta — Unstable · t½ ≈ 17.0 s · Decay: β⁺ → ¹⁶⁴Hf · Type: synthetic · Uses: research.
¹⁶⁵Ta — Unstable · t½ ≈ 19.0 s · Decay: β⁺ → ¹⁶⁵Hf · Type: synthetic · Uses: research.
¹⁶⁶Ta — Unstable · t½ ≈ 22.0 s · Decay: β⁺ → ¹⁶⁶Hf · Type: synthetic · Uses: research.
¹⁶⁷Ta — Unstable · t½ ≈ 19.0 s · Decay: β⁺ → ¹⁶⁷Hf · Type: synthetic · Uses: research.
¹⁶⁸Ta — Unstable · t½ ≈ 30.0 s · Decay: β⁺ → ¹⁶⁸Hf · Type: synthetic · Uses: research.
¹⁶⁹Ta — Unstable · t½ ≈ 3.0 min · Decay: β⁺ → ¹⁶⁹Hf · Type: synthetic · Uses: research.
¹⁷⁰Ta — Unstable · t½ ≈ 6.7 min · Decay: β⁺ → ¹⁷⁰Hf · Type: synthetic · Uses: research.
¹⁷¹Ta — Unstable · t½ ≈ 20.0 min · Decay: β⁺ → ¹⁷¹Hf · Type: synthetic · Uses: research.
¹⁷²Ta — Unstable · t½ ≈ 36.8 min · Decay: β⁺ → ¹⁷²Hf · Type: synthetic · Uses: research.
¹⁷³Ta — Unstable · t½ ≈ 3.14 h · Decay: β⁺ → ¹⁷³Hf · Type: synthetic · Uses: research.
¹⁷⁴Ta — Unstable · t½ ≈ 1.05 h · Decay: β⁺ → ¹⁷⁴Hf · Type: synthetic · Uses: research.
¹⁷⁵Ta — Unstable · t½ ≈ 10.5 h · Decay: β⁻ → ¹⁷⁵W · Type: tracer · Uses: nuclear physics.
¹⁷⁶Ta — Unstable · t½ ≈ 8.1 h · Decay: β⁻ → ¹⁷⁶W · Type: tracer · Uses: nuclear physics.
¹⁷⁷Ta — Unstable · t½ ≈ 56.6 h · Decay: β⁻ → ¹⁷⁷W · Type: tracer · Uses: nuclear physics.
¹⁷⁸Ta — Unstable · t½ ≈ 9.3 min · Decay: β⁻ → ¹⁷⁸W · Type: synthetic · Uses: research.
¹⁷⁹Ta — Unstable · t½ ≈ 1.82 y · Decay: β⁻ → ¹⁷⁹W · Type: tracer · Uses: nuclear research.
¹⁸⁰Taᵐ — Unstable (isomeric state) · t½ > 10¹⁵ y · Decay: γ / β⁻ → ¹⁸⁰Hf or ¹⁸⁰W · Type: rare nuclear isomer (quasi-stable) · Uses: nuclear astrophysics, rare isotope studies.
¹⁸⁰Ta — Unstable · t½ ≈ 8.1 h · Decay: β⁻ → ¹⁸⁰W · Type: synthetic · Uses: research.
¹⁸¹Ta — Stable · — · Type: stable (primordial, dominant natural isotope) · Uses: electronics, alloys, superconductors.
¹⁸²Ta — Unstable · t½ ≈ 114.4 d · Decay: β⁻ → ¹⁸²W · Type: tracer · Uses: geochronology, nuclear physics.
¹⁸³Ta — Unstable · t½ ≈ 5.1 d · Decay: β⁻ → ¹⁸³W · Type: tracer · Uses: nuclear physics.
¹⁸⁴Ta — Unstable · t½ ≈ 8.7 h · Decay: β⁻ → ¹⁸⁴W · Type: synthetic · Uses: research.
¹⁸⁵Ta — Unstable · t½ ≈ 8.2 h · Decay: β⁻ → ¹⁸⁵W · Type: synthetic · Uses: research.
¹⁸⁶Ta — Unstable · t½ ≈ 10.5 min · Decay: β⁻ → ¹⁸⁶W · Type: synthetic · Uses: research.
¹⁸⁷Ta — Unstable · t½ ≈ 2.8 min · Decay: β⁻ → ¹⁸⁷W · Type: synthetic · Uses: research.

Tantalum — isotope count: 33 total · Stable: 1 (¹⁸¹Ta) · Quasi-stable: 1 (¹⁸⁰Taᵐ, the rarest naturally occurring quasi-stable isotope) · Unstable: 31.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ¹⁷⁶Lu–¹⁷⁶Hf/¹⁸²Hf–¹⁸²W dating systems, ¹⁷⁷Lu/¹⁸⁰Taᵐ in nuclear astrophysics, ¹⁸¹Ta in electronics and alloys.)