How many core and valance electrons are in Silicon?

How and when was universal begin? What is smaller than the atomic radius of beryllium (Be)? Can bread be broken down by microorganisms? When a substance is diffused and it is at in the state of equilibrium is it displaying an increase in entropy? What daughter product is produced when thallium-206 an isotope of thallium undergoes beta minus decay? What causes a Buzzing in newly installed ceiling light? Saturn's temperature day and night? Can planets of the solar system be found in the Big Dipper? What are the economic importance of the roots of the plants? Why is phylogenetic classification more natural than a system based on characteristics such as medical uses fullness or the shapes sizes and colors of the body structures? What is the meaning of pus cell many in clumps result in urinalysis? What is feedback and how does it relate to property of life - regulation? Chemical substances needed by body cells that result from the process of digestion are called? What countries that are located in North temperate zone? Who is hail rell and t Moore? Why summer lasts two days longer? What can a 2000 watt continuous power inverter run? What other cities have the same latitude as Chico CA? What is a supernova shrapnel? Which is greater 1500 cubic feet or 400 square feet?