Basic-Chemistry-Hand_37195 - BASIC CHEMISTRY

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BASIC CHEMISTRY Atomic structure (Periodic table): bonds (covalent/ionic/hydrogen); polymers; electron shells o Electrons/proton/neutrons – atomic number=protons; mass number=protons+neutrons; isotopes. o Electron shells=electron energy levels (proximity to the nucleus); represents distance from nucleus o Chemical behavior – related to distribution of electrons in the shells, specifically Æ outermost electrons, ± Electron orbitals – 3D space occupied by electrons in each shell; only 2 e per orbital. ± Unpaired e s in outermost orbitals Æ chemical reactivity Atoms combine to form molecules – chemical bonds o Electronegativity : atoms have different affinities in attracting or “pulling” electrons towards their nucleus; electronegativities of atoms dictate the type of bond formed and the nature of the bonding. o Covalent bond : share electrons; can have double & triple bonds; bonding capacity related to#of unpaired e ‘s ± Polar covalent : bonded atoms with significant difference in electronegativities; charge separation
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This note was uploaded on 10/16/2010 for the course HE 012928 taught by Professor Storrs,london during the Spring '10 term at École Normale Supérieure.

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Basic-Chemistry-Hand_37195 - BASIC CHEMISTRY

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