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Phosphorus hexafluoride ion: Lewis Dot and Cross diagram

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    I need to draw a Lewis dot and cross diagram for the phosphorus hexafluoride ion for my IB Chemistry HL. I tried but ended up with the phosphorus atom having 12 shared electrons with 6 fluorine atoms. But doesn't phosphorus only have 5 electrons to covalently bond with? Ahhhh.

    Help would be much appreciated

    Merry [Belated] Christmas !
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    (Original post by fablesofgray)
    I need to draw a Lewis dot and cross diagram for the phosphorus hexafluoride ion for my IB Chemistry HL. I tried but ended up with the phosphorus atom having 12 shared electrons with 6 fluorine atoms. But doesn't phosphorus only have 5 electrons to covalently bond with? Ahhhh.

    Help would be much appreciated

    Merry [Belated] Christmas !
    Just do it one step at a time...

    Phosphorus has 5 outer electrons = 5
    Each fluorine provides 1 electron = 6
    The negative charge must be added in = 1
    -------------------------------------------------------- add together
    Total electrons around the phosphorus = 12

    This makes 6 pairs = electronically octahedral

    Each P-F bond requires 2 electrons and there are 6 P-F bonds = 12 electrons

    Hence all electrons used up in bonding. Ionic shape is also octahedral.
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    (Original post by charco)
    Just do it one step at a time...

    Phosphorus has 5 outer electrons = 5
    Each fluorine provides 1 electron = 6
    The negative charge must be added in = 1
    -------------------------------------------------------- add together
    Total electrons around the phosphorus = 12

    This makes 6 pairs = electronically octahedral

    Each P-F bond requires 2 electrons and there are 6 P-F bonds = 12 electrons

    Hence all electrons used up in bonding. Ionic shape is also octahedral.
    Thank you!

    Haven't learnt about VSEPRT and hybridisation yet... but will do so soon

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Updated: December 29, 2011
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