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Si
Silicon
23 known isotopes (3 stable,
20 radioactive)
22Si
Mass
22.036114 u
Abundance —
Half-life 29 milliseconds
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%), β⁺p (32%)
23Si
Mass
23.025711 u
Abundance —
Half-life 42.3 milliseconds
Spin/Parity (5/2)+
Decay Mode(s) EC/β⁺ (100%), ECP (88%), EC2P (3.6%)
24Si
Mass
24.011535 u
Abundance —
Half-life 141.3 milliseconds
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%), ECP (32.4%)
25Si
Mass
25.004109 u
Abundance —
Half-life 220 milliseconds
Spin/Parity 5/2+
Decay Mode(s) EC/β⁺ (100%), β⁺p (35%)
26Si
Mass
25.992334 u
Abundance —
Half-life 2.2453 seconds
Spin/Parity 0+
Decay Mode(s) EC/β⁺ (100%)
27Si
Mass
26.986705 u
Abundance —
Half-life 4.15 seconds
Spin/Parity 5/2+
Decay Mode(s) EC/β⁺ (100%)
28Si Stable
Mass
27.976927 u
Abundance 92.2545%
Half-life Stable
Spin/Parity 0+
Decay Mode(s) —
29Si Stable
Mass
28.976495 u
Abundance 4.6720%
Half-life Stable
Spin/Parity 1/2+
Decay Mode(s) —
30Si Stable
Mass
29.973770 u
Abundance 3.0735%
Half-life Stable
Spin/Parity 0+
Decay Mode(s) —
31Si
Mass
30.975363 u
Abundance —
Half-life 157.24 m
Spin/Parity 3/2+
Decay Mode(s) β⁻ (100%)
32Si
Mass
31.974152 u
Abundance —
Half-life 157 years
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
33Si
Mass
32.977977 u
Abundance —
Half-life 6.11 seconds
Spin/Parity 3/2+
Decay Mode(s) β⁻ (100%)
34Si
Mass
33.978538 u
Abundance —
Half-life 2.77 seconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
35Si
Mass
34.984550 u
Abundance —
Half-life 0.78 seconds
Spin/Parity (7/2)-
Decay Mode(s) β⁻ (100%), β⁻n (5%)
36Si
Mass
35.986649 u
Abundance —
Half-life 0.45 seconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%), β⁻n (10%)
37Si
Mass
36.992945 u
Abundance —
Half-life 90 milliseconds
Spin/Parity (5/2-)
Decay Mode(s) β⁻ (100%), β⁻n (17%)
38Si
Mass
37.995523 u
Abundance —
Half-life 63 milliseconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%), β⁻n (25%)
39Si
Mass
39.002491 u
Abundance —
Half-life 47.5 milliseconds
Spin/Parity (5/2-)
Decay Mode(s) β⁻ (100%)
40Si
Mass
40.006084 u
Abundance —
Half-life 33.0 milliseconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
41Si
Mass
41.014171 u
Abundance —
Half-life 20.0 milliseconds
Spin/Parity —
Decay Mode(s) β⁻ (100%), β⁻n (0%)
42Si
Mass
42.018078 u
Abundance —
Half-life 12.5 milliseconds
Spin/Parity 0+
Decay Mode(s) β⁻ (100%)
43Si
Mass
43.026119 u
Abundance —
Half-life 60 nanoseconds
Spin/Parity —
Decay Mode(s) Unknown
44Si
Mass
44.031466 u
Abundance —
Half-life 360 nanoseconds
Spin/Parity 0+
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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