Silicon (14Si) has 23 known isotopes, with mass numbers ranging from 22 to 44. … The longest-lived radioisotope is 32Si, which is produced by cosmic ray spallation of argon.

Is SI-30 the most abundant?

Silicon has nine isotopes, with mass numbers from 25-33. Si (the most abundant isotope, at 92.23%), 29Si (4.67%), and 30Si (3.1%) are stable; 32Si is a radioactive isotope produced by argon decay.

What is the normal phase of silicon?

Classified as a metalloid, Silicon is a solid at room temperature.