quick review I

quick review I - CHEMISTRY Most chemistry is in the...

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Unformatted text preview: CHEMISTRY Most chemistry is in the electrons (the valence electrons) Representation of the 2 p orbitals. Wolfgang Pauli 1s 2 2s 2 2p 6 3s 2 3p 4 The orbitals filled for elements in various parts CHEMISTRY Full shells make the most stable atoms Special names for groups in the periodic table The values of first ionization energy for the elements in the first five periods. Atomic radii (in picometers) for selected atoms. The HCL molecule has a dipole moment The Pauling electronegativity values as updated by A.L. Allred in 1961. (contd) Arbitrarily set F as 4 Skeletal Structure Hydrogen atoms are always terminal atoms. Central atoms are generally those with the lowest electronegativity. Carbon atoms are always central atoms. Generally structures are compact and symmetrical. Exceptions to the Octet Rule Molecules with an odd number of electrons. Molecules in which an atom has less than an octet of electrons. Molecules in which an atom has more than an octet of electrons. Resonance Forms Lewis structures that differ only in the placement of electrons are resonance forms. For O 3 : Experimentally, it is found that both bonds are 0.128 nm long. The Lewis structure of O 3 must show both resonance forms. O O O O O O = = Formal Charges The formal charge on an atom assumes that the bonding electrons are shared equally....
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This note was uploaded on 05/04/2008 for the course CHEM 1C taught by Professor Hooker during the Spring '06 term at UCSB.

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quick review I - CHEMISTRY Most chemistry is in the...

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