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    ...how do you know how big the elements are in the periodic table to determine whether some compounds have a degree of covalent character?

    I'm really stuck coz I don't understand why sodium chloride is ionic but aluminium chloride is covalent when aluminium has more shielding shells???

    any help will do!
    fanx
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    Ionic bonding happens between a metal and a non metal (eg left hand groups 1&2 side & right hand side of periodic table groups 5-7)

    Covalent bonding is usually found in compounds of non-metal with another non metal (usually groups 4-7).

    Does this help?
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    Another way is using electronegativities - if there is a large difference in electronegativity (the attraction that one element has for an electron in a bond) then the compound is likely to be ionic, if there is a small difference, or no difference, then the molecule will be polar covalent/pure covalent respectively.
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    if the difference in electronegativites r >1.5 - ionic,
    <1.5 polar covalent and 0 means pure covalent.

    i think this is a way
    --------------
    i found a good link for you as well
    http://www.chemguide.co.uk/inorganic...chlorides.html
 
 
 
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