...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!
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This sounds like a stupid question but... watch
- Thread Starter
- 12-11-2005 14:26
- 12-11-2005 14:31
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?
- 12-11-2005 16:33
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.
- 12-11-2005 22:46
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