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- Critical Temperature of Holmium
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- 55 (Atomic Number of Cesium)
- Curie Point of Strontium in °F
Ac
Actinium
32 known isotopes (0 stable,
32 radioactive)
205Ac
Mass
205.015144 u
Abundance —
Half-life 20 milliseconds
Spin/Parity (9/2-)
Decay Mode(s) α (100%)
206Ac
Mass
206.014476 u
Abundance —
Half-life 22 milliseconds
Spin/Parity (3+)
Decay Mode(s) α (100%)
207Ac
Mass
207.011966 u
Abundance —
Half-life 27 milliseconds
Spin/Parity (9/2-)
Decay Mode(s) α (100%)
208Ac
Mass
208.011552 u
Abundance —
Half-life 95 milliseconds
Spin/Parity (3+)
Decay Mode(s) α (99%), Electron capture (1%)
209Ac
Mass
209.009495 u
Abundance —
Half-life 0.087 seconds
Spin/Parity (9/2-)
Decay Mode(s) α (100%)
210Ac
Mass
210.009409 u
Abundance —
Half-life 0.35 seconds
Spin/Parity —
Decay Mode(s) α (100%)
211Ac
Mass
211.007669 u
Abundance —
Half-life 0.21 seconds
Spin/Parity 9/2-
Decay Mode(s) α (100%), EC/β⁺ (0.2%)
212Ac
Mass
212.007836 u
Abundance —
Half-life 880 milliseconds
Spin/Parity (7+)
Decay Mode(s) α (95%), EC/β⁺ (5%)
213Ac
Mass
213.006593 u
Abundance —
Half-life 738 milliseconds
Spin/Parity 9/2-
Decay Mode(s) α (100%)
214Ac
Mass
214.006906 u
Abundance —
Half-life 8.2 seconds
Spin/Parity 5(+)
Decay Mode(s) α (89%), Electron capture (11%)
215Ac
Mass
215.006474 u
Abundance —
Half-life 0.17 seconds
Spin/Parity 9/2-
Decay Mode(s) α (99.91%), EC/β⁺ (0.09%)
216Ac
Mass
216.008749 u
Abundance —
Half-life 440 microseconds
Spin/Parity (1-)
Decay Mode(s) α (100%)
217Ac
Mass
217.009342 u
Abundance —
Half-life 69 nanoseconds
Spin/Parity 9/2-
Decay Mode(s) α (100%), EC/β⁺ (2%)
218Ac
Mass
218.011649 u
Abundance —
Half-life 1.03 microseconds
Spin/Parity (1-)
Decay Mode(s) α (100%)
219Ac
Mass
219.012420 u
Abundance —
Half-life 11.8 microseconds
Spin/Parity 9/2-
Decay Mode(s) α (100%)
220Ac
Mass
220.014755 u
Abundance —
Half-life 26.4 milliseconds
Spin/Parity (3-)
Decay Mode(s) α (100%), Electron capture (0.0005%)
221Ac
Mass
221.015600 u
Abundance —
Half-life 52 milliseconds
Spin/Parity (3/2-)
Decay Mode(s) α (100%)
222Ac
Mass
222.017844 u
Abundance —
Half-life 5.0 seconds
Spin/Parity 1-
Decay Mode(s) α (99%), EC/β⁺ (1%)
223Ac
Mass
223.019136 u
Abundance —
Half-life 2.10 m
Spin/Parity (5/2-)
Decay Mode(s) α (99%), Electron capture (1%)
224Ac
Mass
224.021722 u
Abundance —
Half-life 2.78 h
Spin/Parity (0-)
Decay Mode(s) Electron capture (90.9%), α (9.1%)
225Ac
Mass
225.023229 u
Abundance —
Half-life 9.920 d
Spin/Parity (3/2-)
Decay Mode(s) α (100%), 14C (5.3e-10%)
226Ac
Mass
226.026097 u
Abundance —
Half-life 29.37 h
Spin/Parity (1)
Decay Mode(s) β⁻ (83%), Electron capture (17%), α (0.006%)
227Ac
Mass
227.027751 u
Abundance —
Half-life 21.772 years
Spin/Parity 3/2-
Decay Mode(s) β⁻ (98.62%), α (1.38%)
228Ac
Mass
228.031020 u
Abundance —
Half-life 6.15 h
Spin/Parity 3+
Decay Mode(s) β⁻ (100%)
229Ac
Mass
229.032947 u
Abundance —
Half-life 62.7 m
Spin/Parity (3/2+)
Decay Mode(s) β⁻ (100%)
230Ac
Mass
230.036327 u
Abundance —
Half-life 122 seconds
Spin/Parity (1+)
Decay Mode(s) β⁻ (100%), B-SF (0.0000012%)
231Ac
Mass
231.038393 u
Abundance —
Half-life 7.5 m
Spin/Parity 1/2+
Decay Mode(s) β⁻ (100%)
232Ac
Mass
232.042034 u
Abundance —
Half-life 119 seconds
Spin/Parity (1+)
Decay Mode(s) β⁻ (100%)
233Ac
Mass
233.044346 u
Abundance —
Half-life 143 seconds
Spin/Parity (1/2+)
Decay Mode(s) β⁻ (100%)
234Ac
Mass
234.048139 u
Abundance —
Half-life 44 seconds
Spin/Parity —
Decay Mode(s) β⁻ (100%)
235Ac
Mass
235.050840 u
Abundance —
Half-life 62 seconds
Spin/Parity —
Decay Mode(s) Unknown
236Ac
Mass
236.054988 u
Abundance —
Half-life 1.2 m
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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