14-silicon Naturally occuring isotopes:
Si-28 ( 92.23% ) Si-29 ( 4.67% ) Si-30 ( 3.10% )
Isotopes:
Si-22 Si-23 Si-24 Si-25 Si-26 Si-27 Si-31 Si-32 Si-33 Si-34 Si-35 Si-36 Si-37 Si-38 Si-39 Si-40 Si-41 Si-42

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