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Covalent + Dative bond = ?

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    This question plz :

    The nitrate ion, NO3–, in Ca(NO3)2 contains both covalent and dative covalent bonds.
    Explain how.

    Thanks
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    (Original post by LegendX)
    This question plz :

    The nitrate ion, NO3–, in Ca(NO3)2 contains both covalent and dative covalent bonds.
    Explain how.

    Thanks
    There is covalent bonding within the nitrate anion between the N and O atoms, but there is dative covalent bonding between the one of the lone pairs of electrons on one of the oxygen atoms, and the Ca2+ ion.
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    (Original post by thegodofgod)
    There is covalent bonding within the nitrate anion between the N and O atoms, but there is dative covalent bonding between the one of the lone pairs of electrons on one of the oxygen atoms, and the Ca2+ ion.
    But isn't that a metal and a non metal so isn't that ironically bonded?
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    (Original post by LegendX)
    But isn't that a metal and a non metal so isn't that ironically bonded?
    It's ionic as well, as there is a transfer of electrons (2 from 1 calcium atom, of which 1 electron goes to each nitrate ion).

    I'd suggest drawing out the dot-cross structure of Ca(NO3)2, which should help you out with visualising it
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    (Original post by thegodofgod)
    It's ionic as well, as there is a transfer of electrons (2 from 1 calcium atom, of which 1 electron goes to each nitrate ion).

    I'd suggest drawing out the dot-cross structure of Ca(NO3)2, which should help you out with visualising it
    Hmm anyone chance you can show me?
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    I tried to draw out the diagram, I had a nitrogen atom bonded to 3 oxygens and it having 1 lone pair left.
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    (Original post by LegendX)
    Hmm anyone chance you can show me?
    Just made one, see attached image; notice how each NO3- ion has a formal charge of -1, although within the ion there is a +1 charge and 2 x -1 charge (making an overall charge of -1)
    Attached Thumbnails
    Click image for larger version. 

Name:	Calcium Nitrate TSR.JPG 
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