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Topic: Ionic bond! (One old question!)  (Read 7037 times)

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777888

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Ionic bond! (One old question!)
« on: November 28, 2004, 01:47:44 AM »
When we determine if a bond is ionic, do we compare the difference of electronegativities and see if the value exceeds 1.7 OR just remember that metal+non-metal-->ionic bond?
« Last Edit: November 28, 2004, 01:48:13 AM by 777888 »
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Offline Mitch

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Re:Ionic bond! (One old question!)
« Reply #1 on: November 28, 2004, 04:36:55 AM »
You have to keep in mind all those things.
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777888

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Re:Ionic bond! (One old question!)
« Reply #2 on: November 28, 2004, 02:42:14 PM »
Because sometimes metal+non-metal but their difference of electronegativies do not exceed 1.7
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Demotivator

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Re:Ionic bond! (One old question!)
« Reply #3 on: November 28, 2004, 03:07:06 PM »
Electronegativity is the better rule of thumb.
There are examples of metal-non metal covalent bonds (or bonds of mixed character)  like BCl3 and transition metal - ligand bonds.
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Offline Donaldson Tan

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Re:Ionic bond! (One old question!)
« Reply #4 on: November 28, 2004, 05:31:40 PM »
although electronegativity difference of 1.7 is a good guage, always keep in mind the known exceptions.
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bindy

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Re:Ionic bond! (One old question!)
« Reply #5 on: December 04, 2004, 02:56:20 AM »
HF is a good exception,although EN exceeds 1.7,its still co-valent bond.
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kdt5

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Re:Ionic bond! (One old question!)
« Reply #6 on: December 10, 2004, 09:02:12 AM »
AlCl3 too,there are bond metal+ non-metal but they are covalent bond because EN lower than 1.7 ....is that right????
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Offline jdurg

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Re:Ionic bond! (One old question!)
« Reply #7 on: December 10, 2004, 09:25:49 AM »
I believe that is correct.  It's pretty much the same thing with beryllium.  I'm pretty certain that BeO is a covalently bonded compound and not ionic.
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