2, the amount is large, and the content of silicon in nature is extremely rich, and the content of silicon in the crust is almost 30%;
3, cheap, because of the large quantity, so cheap, not much explanation, this can be traced back to the invention of the first IC. Jacob of Texas Instruments first invented the integrated circuit based on nickel, and then Noyce of Intel invented the integrated circuit based on silicon. As a result, Noyce came from behind and obtained American patent certification (both of them were later considered as inventors of IC, and Jacob won the Nobel Prize for this), because silicon is cheap and suitable for commercial promotion.
There are many kinds of silicon compounds.