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Silicon has 23 known isotopes, with mass numbers ranging from 22 to 44. Si , Si , and Si are stable. The longest-lived radioisotope is Si, which is produced by cosmic ray spallation of argon. Its half-life has been determined to be approximately 150 years , and it decays by beta emission to P and then to S. After Si, Si has the second longest half-life at 157.3 minutes. All others have half-lives under 7 seconds.
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