For Si,

(b) (7) We have N silicon atoms in a piece of Si crystal. How many electrons are there in 3s and 3p orbitals as a function of N if these atoms were far from each other? How many electrons are there in the valence and conduction bands at 0 K, if we bring these atoms close to each other to the actual spacing in the Si crystal? Draw a schematic showing how the conduction and valence bands are formed when these atoms are brought close to each other at the actual spacing. What will happen to the bandgap of Si when temperature increases? Explain.

(b) (7) We have N silicon atoms in a piece of Si crystal. How many electrons are there in 3s and 3p orbitals as a function of N if these atoms were far from each other? How many electrons are there in the valence and conduction bands at 0 K, if we bring these atoms close to each other to the actual spacing in the Si crystal? Draw a schematic showing how the conduction and valence bands are formed when these atoms are brought close to each other at the actual spacing. What will happen to the bandgap of Si when temperature increases? Explain