105molecularstructure

105molecularstructure - Molecular Structure Glenn V. Lo...

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    Molecular Structure Glenn V. Lo Department of Physical Sciences Nicholls State University
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    Covalent Bonding Covalent bonding: sharing of electrons Molecule: an electrically neutral group of two  or more atoms sharing electrons If the group is not electrically neutral, it’s called a  polyatomic ion Covalent bonding tends to occur between  nonmetal atoms.  Electron transfer, instead of  sharing, is more likely between a metal and a  nonmetal. Why?
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    Covalent Bonding Covalent bonding tends to occur between  nonmetal atoms.  Electron transfer, instead of  sharing, is more likely between a metal and a  nonmetal. For which pair is covalent bonding  likely to occur? Na and Cl Cl and Cl H and Br C and O
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    Lewis dot symbol Covalent bonding behavior of atoms depends  on valence configuration same group   same valence configuration    similar pattern Lewis dot symbol: shows valence electrons  as dots around the symbol for an atom.  Example: N:  [He] 2s 2  2p 3  (five valence electrons) Lewis symbol: N
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    Lewis dot symbol Main groups (the “A” groups): number of  dots = number of valence electrons =  group #; indicate non-zero charge  outside square brackets  Which of the following are correctly  drawn Lewis dot symbols?
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    Lewis structures Lewis dot symbol for noble gases: Draw eight dots (representing valence electrons) Exception: He (two dots) Lewis structure: a sketch showing how atoms  in a molecule or polyatomic ion are sharing  valence electrons Follow octet rule: share valence electrons so that  each atom appears surrounded by eight dots. Follow duet rule for H Atoms acquire a noble-gas-like configuration by  following the octet/duet rule.
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    Interpreting Lewis Structures Dots = valence electrons Dash = same as a pair of dots; a shared  pair of electrons
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105molecularstructure - Molecular Structure Glenn V. Lo...

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