The band gap in silicon is 1.12 eV. Calculate the maximum wavelength of electromagnetic radiation that results in promotion of electrons from the valence to the conduction band.
Week 2Chemistry 101 Notes Chapter 1.1 Matter: o All matter is made up of atoms o Chemistry provides tools to classify matter Elements o All atoms of an element contain the same properties Compounds o Combinations of elements (example: H O,2KMnO ) 4 Classifications of Matter Matter Pure Substance: Mixture: Element. 2 or more elements Compound 2 or more compounds Another name for a homogeneous mixture is a solution Chapter 1.2 1. Atomic number H Atomic symbol Chemical formulas are written using atomic symbols. Atomic number = number of protons Mass number = number of protons + number of neutrons Neutral element number of protons = number of electrons Chapter 1.3 John Dalton (17661844) o English chemist, meteorologist, & physicist o Developed atomic theory Atomic Theory: o Elements are made of atoms o Elements cannot be broken down (PROVEN FALSE) The atomic theory was recently disproven because element can be broken down. Subatomic particles: o Protonspositive charge (size = 1.67 x 10 ) o Neutronsno charge (size= 1.67x 10 )24 o Electronsnega