CHEM 10171 Lecture Notes - Lecture 1: Unified Atomic Mass Unit, Relative Atomic Mass, Electromagnetic Radiation
31 Aug 2016
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Approximately 10^-10m (nucleus is 10^-14m = mass of atom concentrated) Electrons have equal and opposite charge as protons (1. 602 x 10^-19c) Atomic # (z) number of protons (n) number of neutrons. Isotopes- same number of protons, different number of neutrons. Isotopic mass: relative mass of an isotope relative to the 12c chosen standard. Amu= 1 atomic mass unit => 1 dalton (d)= 1/12 the mass of carbon (because so many compounds have carbon in them) Atomic mass (atomic weight)- average of masses of its naturally occurring isotopes weighted according to abundance. About 6. 022 x 10^23 atoms in a mole avogadro"s number . Atomic weight/ molecular weight/ formula weight atoms, molecules, structures. Chemistry depends on **movement of electrons** binding and motions within atoms and molecules. Wavelength: distance between identical points on the wave. Frequency: # of identical points passing per second (all frequency is the same in a vacuum speed of light 2. 998x10^8c m/s)
