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Tl
Thallium
42 known isotopes (2 stable,
40 radioactive)
176Tl
Mass
176.000628 u
Abundance —
Half-life 5.2 milliseconds
Spin/Parity (3- 4- 5-)
Decay Mode(s) Proton emission (100%)
177Tl
Mass
176.996414 u
Abundance —
Half-life 18 milliseconds
Spin/Parity (1/2+)
Decay Mode(s) α (73%), Proton emission (27%)
178Tl
Mass
177.995047 u
Abundance —
Half-life 254 milliseconds
Spin/Parity —
Decay Mode(s) α (53%), EC/β⁺ (47%)
179Tl
Mass
178.991122 u
Abundance —
Half-life 0.23 seconds
Spin/Parity (1/2+)
Decay Mode(s) α (100%)
180Tl
Mass
179.989919 u
Abundance —
Half-life 1.09 seconds
Spin/Parity (5-)
Decay Mode(s) EC/β⁺ (94%), α (6%), ECSF (0.0032%)
181Tl
Mass
180.986260 u
Abundance —
Half-life 3.2 seconds
Spin/Parity (1/2+)
Decay Mode(s) α (10%)
182Tl
Mass
181.985693 u
Abundance —
Half-life 3.1 seconds
Spin/Parity (7+)
Decay Mode(s) EC/β⁺ (97.5%), α (5%)
183Tl
Mass
182.982193 u
Abundance —
Half-life 6.9 seconds
Spin/Parity (1/2+)
Decay Mode(s) EC/β⁺ (0%)
184Tl
Mass
183.981875 u
Abundance —
Half-life 10.1 seconds
Spin/Parity —
Decay Mode(s) EC/β⁺ (97.9%), α (2.1%)
185Tl
Mass
184.978789 u
Abundance —
Half-life 19.5 seconds
Spin/Parity (1/2+)
Decay Mode(s) Unknown
186Tl
Mass
185.978655 u
Abundance —
Half-life 3.4 seconds
Spin/Parity (2-)
Decay Mode(s) Unknown
187Tl
Mass
186.975905 u
Abundance —
Half-life 51 seconds
Spin/Parity (1/2+)
Decay Mode(s) EC/β⁺ (100%), α (0.03%)
188Tl
Mass
187.976021 u
Abundance —
Half-life 71 seconds
Spin/Parity (2-)
Decay Mode(s) EC/β⁺ (100%)
189Tl
Mass
188.973574 u
Abundance —
Half-life 2.3 m
Spin/Parity (1/2+)
Decay Mode(s) EC/β⁺ (100%)
190Tl
Mass
189.973842 u
Abundance —
Half-life 2.6 m
Spin/Parity 2-
Decay Mode(s) EC/β⁺ (100%)
191Tl
Mass
190.971784 u
Abundance —
Half-life Unknown
Spin/Parity (1/2+)
Decay Mode(s) Unknown
192Tl
Mass
191.972225 u
Abundance —
Half-life 9.6 m
Spin/Parity (2-)
Decay Mode(s) EC/β⁺ (100%)
193Tl
Mass
192.970502 u
Abundance —
Half-life 21.6 m
Spin/Parity 1/2(+)
Decay Mode(s) EC/β⁺ (100%)
194Tl
Mass
193.971081 u
Abundance —
Half-life 33.0 m
Spin/Parity 2-
Decay Mode(s) EC/β⁺ (100%), α (1e-7%)
195Tl
Mass
194.969774 u
Abundance —
Half-life 1.16 h
Spin/Parity 1/2+
Decay Mode(s) EC/β⁺ (100%)
196Tl
Mass
195.970481 u
Abundance —
Half-life 1.84 h
Spin/Parity 2-
Decay Mode(s) EC/β⁺ (100%)
197Tl
Mass
196.969560 u
Abundance —
Half-life 2.84 h
Spin/Parity 1/2+
Decay Mode(s) EC/β⁺ (100%)
198Tl
Mass
197.970447 u
Abundance —
Half-life 5.3 h
Spin/Parity 2-
Decay Mode(s) EC/β⁺ (100%)
199Tl
Mass
198.969877 u
Abundance —
Half-life 7.42 h
Spin/Parity 1/2+
Decay Mode(s) EC/β⁺ (100%)
200Tl
Mass
199.970964 u
Abundance —
Half-life 26.1 h
Spin/Parity 2-
Decay Mode(s) EC/β⁺ (100%)
201Tl
Mass
200.970820 u
Abundance —
Half-life 3.0420 d
Spin/Parity 1/2+
Decay Mode(s) Electron capture (100%)
202Tl
Mass
201.972109 u
Abundance —
Half-life 12.31 d
Spin/Parity 2-
Decay Mode(s) EC/β⁺ (100%)
203Tl Stable
Mass
202.972344 u
Abundance 29.5150%
Half-life Stable
Spin/Parity 1/2+
Decay Mode(s) —
204Tl
Mass
203.973863 u
Abundance —
Half-life 3.783 years
Spin/Parity 2-
Decay Mode(s) β⁻ (97.08%), EC/β⁺ (2.92%)
205Tl Stable
Mass
204.974427 u
Abundance 70.4850%
Half-life Stable
Spin/Parity 1/2+
Decay Mode(s) —
206Tl
Mass
205.976110 u
Abundance —
Half-life 4.202 m
Spin/Parity 0-
Decay Mode(s) β⁻ (100%)
207Tl
Mass
206.977419 u
Abundance —
Half-life 4.77 m
Spin/Parity 1/2+
Decay Mode(s) β⁻ (100%)
208Tl
Mass
207.982018 u
Abundance —
Half-life 3.053 m
Spin/Parity 5+
Decay Mode(s) β⁻ (100%)
209Tl
Mass
208.985352 u
Abundance —
Half-life 2.162 m
Spin/Parity 1/2+
Decay Mode(s) β⁻ (100%)
210Tl
Mass
209.990073 u
Abundance —
Half-life 1.30 m
Spin/Parity (5+)
Decay Mode(s) β⁻ (100%), β⁻n (0.007%)
211Tl
Mass
210.993475 u
Abundance —
Half-life 88 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
212Tl
Mass
211.998335 u
Abundance —
Half-life 30.9 seconds
Spin/Parity (5+)
Decay Mode(s) β⁻ (100%), β⁻n (1.8%)
213Tl
Mass
213.001915 u
Abundance —
Half-life 23.8 seconds
Spin/Parity (1/2+)
Decay Mode(s) β⁻ (100%), β⁻n (7.6%)
214Tl
Mass
214.006940 u
Abundance —
Half-life 11.0 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%), β⁻n (34%)
215Tl
Mass
215.010768 u
Abundance —
Half-life 9.7 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%), β⁻n (4.6%)
216Tl
Mass
216.015964 u
Abundance —
Half-life 300 nanoseconds
Spin/Parity —
Decay Mode(s) Unknown
217Tl
Mass
217.020032 u
Abundance —
Half-life Unknown
Spin/Parity —
Decay Mode(s) β⁻ (100%)
Decay mode abbreviations:
β⁻ = Beta minus decay, β⁺ = Beta plus decay, EC = Electron capture, α = Alpha decay
n = Neutron emission, p = Proton emission, SF = Spontaneous fission, IT = Isomeric transition
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