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    riehmma's Avatar
    riehmma Posts: 7, Reputation: 1
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    #1

    Jan 16, 2008, 01:03 PM
    Polar Covalent Bonds
    Which of the following would you expect to have polar covalent bonds?
    A) MgF2
    B) N2
    C) F2
    D) NF3
    E) NaF
    SirOracle's Avatar
    SirOracle Posts: 11, Reputation: 1
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    #2

    Jan 17, 2008, 10:14 PM
    Okay, we can cancel MgF2 and NaF right away because they have bonds between metals and nonmetals, which are ionic and not covalent

    N2 and F2 are both diatomic molecules where both atoms are the same, and thus they will not be polar

    NF3 is the only choice left, and this makes sense because the nitrogen will have a lone pair of electrons forming one "corner" of its tetrahedral shape, causing it to be polar
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