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Isotopes of silicon
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<p><a href="/facts/Silicon/cgWx0hdr">Silicon</a> (14Si) has 25 known <a href="/facts/Isotope/KD9B1y6o">isotopes</a>, with <a href="/facts/Mass_number/VyBbJ1oI">mass numbers</a> ranging from 22 to 46. 28Si (the most abundant isotope, at 92.23%), 29Si (4.67%), and 30Si (3.1%) are stable. The longest-lived radioisotope is 32Si, which is produced by <a href="/facts/Cosmic_ray_spallation/gSlq9VEP">cosmic ray spallation</a> of <a href="/facts/Argon/QX6NRH6d">argon</a>. Its <a href="/facts/Half-life/kGVH8BAB">half-life</a> has been determined to be approximately 150 years (with <a href="/facts/Decay_energy/g4wDGC8r">decay energy</a> 0.21 MeV), and it decays by <a href="/facts/Beta_decay/vxTBlckp">beta emission</a> to 32<a href="/facts/Phosphorus/27xCeIqs">P</a> (which has a 14.27-day half-life) and then to 32<a href="/facts/Sulfur/IK0amTfM">S</a>. After 32Si, 31Si has the second longest half-life at 157.3 minutes. All others have half-lives under 7 seconds. </p>