A couple of questions

I’m not sure exactly what sorts of things we are supposed to post to this blog, but I have a couple of questions, so I guess I’ll start there.

My first question is about the silicon-oxygen tetrahedron.  The text says “this structure consists of four oxygen atoms surrounding a much smaller silicon atom.”  My question is, why is Silicon (atomic number 14, atomic weight 28.09) much smaller than Oxygen (atomic number 8, atomic weight 16)?

My other question is really a question for Dr. Kaden, but I thought I’d post it here in case I am not the only one wondering.  The syllabus mentions that students need to “read lecture PP files.”  Where do we find these?  Will they be on mygeoscienceplace?

Thanks for your help!