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- Calcium
- Space Group Name of Astatine
- Xe (Symbol of Xenon)
- 52 (Atomic Number of Tellurium)
- Lattice Constants of Astatine in mm
Cf
Californium
21 known isotopes (0 stable,
21 radioactive)
236Cf
Mass
— u
Abundance —
Half-life Unknown
Spin/Parity —
Decay Mode(s) Unknown
237Cf
Mass
237.062199 u
Abundance —
Half-life 2.1 seconds
Spin/Parity —
Decay Mode(s) α (70%), Spontaneous fission (10%)
238Cf
Mass
238.061490 u
Abundance —
Half-life 21.1 milliseconds
Spin/Parity 0+
Decay Mode(s) Spontaneous fission (95%), α (5%)
239Cf
Mass
239.062482 u
Abundance —
Half-life 39 seconds
Spin/Parity —
Decay Mode(s) Unknown
240Cf
Mass
240.062253 u
Abundance —
Half-life 0.96 m
Spin/Parity 0+
Decay Mode(s) α (98%), Spontaneous fission (2%)
241Cf
Mass
241.063690 u
Abundance —
Half-life 3.78 m
Spin/Parity (7/2-)
Decay Mode(s) EC/β⁺ (75%), α (25%)
242Cf
Mass
242.063755 u
Abundance —
Half-life 3.5 m
Spin/Parity 0+
Decay Mode(s) α (61%), EC/β⁺ (39%), Spontaneous fission (0.014%)
243Cf
Mass
243.065475 u
Abundance —
Half-life 10.7 m
Spin/Parity (1/2+)
Decay Mode(s) EC/β⁺ (86%), α (14%)
244Cf
Mass
244.065999 u
Abundance —
Half-life 19.4 m
Spin/Parity 0+
Decay Mode(s) α (100%)
245Cf
Mass
245.068047 u
Abundance —
Half-life 45.0 m
Spin/Parity 1/2+
Decay Mode(s) Electron capture (64.7%), α (35.3%)
246Cf
Mass
246.068804 u
Abundance —
Half-life 35.7 h
Spin/Parity 0+
Decay Mode(s) α (100%), Electron capture (0.004%), Spontaneous fission (0.00024%)
247Cf
Mass
247.070971 u
Abundance —
Half-life 3.11 h
Spin/Parity (7/2+)
Decay Mode(s) Electron capture (99.965%), α (0.035%)
248Cf
Mass
248.072183 u
Abundance —
Half-life 333.5 d
Spin/Parity 0+
Decay Mode(s) α (99.9971%), Spontaneous fission (0.0029%)
249Cf
Mass
249.074850 u
Abundance —
Half-life 351 years
Spin/Parity 9/2-
Decay Mode(s) α (100%), Spontaneous fission (5e-7%)
250Cf
Mass
250.076404 u
Abundance —
Half-life 13.08 years
Spin/Parity 0+
Decay Mode(s) α (99.923%), Spontaneous fission (0.077%)
251Cf
Mass
251.079587 u
Abundance —
Half-life 898 years
Spin/Parity 1/2+
Decay Mode(s) α (100%)
252Cf
Mass
252.081627 u
Abundance —
Half-life 2.647 years
Spin/Parity 0+
Decay Mode(s) α (96.898%), Spontaneous fission (3.102%)
253Cf
Mass
253.085134 u
Abundance —
Half-life 17.81 d
Spin/Parity (7/2+)
Decay Mode(s) β⁻ (99.69%), α (0.31%)
254Cf
Mass
254.087324 u
Abundance —
Half-life 60.5 d
Spin/Parity 0+
Decay Mode(s) Spontaneous fission (99.69%), α (0.31%)
255Cf
Mass
255.091046 u
Abundance —
Half-life 85 m
Spin/Parity (7/2+)
Decay Mode(s) β⁻ (100%)
256Cf
Mass
256.093442 u
Abundance —
Half-life 12.3 m
Spin/Parity 0+
Decay Mode(s) Spontaneous fission (100%), α (0.000001%)
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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