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I desperately need a formula 2 calculate
% of covalent character in an ionic bond...
and secondly...please tell me why the bond angle of BF
3
is max as compared 2 other halides of boron...

2007-10-12 17:32:31 · 1 answers · asked by Anonymous in Science & Mathematics Chemistry

1 answers

Percent Covalent character in ionic bonds depends upon the charge on the cation and the size of the cation.
Greater the charge density on the positive ion Larger the size of the cation ,the greater its polarizing power and greater the covalent character of the bond it forms with the given negative ion.

Bond angle of BF3:

Here Boron is very small cation and has three positive charges hence he BF3 bond has covalent character .
The bond angle
FBF bond angle 120°

According to the Lewis structure, B in BF3 has not got the electron octet of 8 electrons. Some authors use a dativ covalent bond, using electrons from a F atom, to form an electron octet around B. The molecule can then be described as having three resonance structures. Giving it maximum stability.

2007-10-15 19:05:47 · answer #1 · answered by ~* The BookWorm *~ 2 · 0 0

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