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Chemistry: the shape of the BCl4^-

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Posted by Studentbox user
on 01/09/2017 at in  Science
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I understand Boron to have 6 valence electrons, as it does not obey the octet rule. 
However, why is the BCl4^- molecule tetrahedral in shape, if the boron can't have 8 valence electrons in its outer shell? 
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  • admin
    Studentbox User
    Boron has 3 valence electrons, and each of the four fluorides contributes one electron to each covalent bond. The overall negative charge of the molecule contributes another electron (The single negative charge is shared by the four fluoride atoms/ions), so overall we have 3 + 4 + 1 = 8 valence electrons which form 4 electron pairs and thus causing the tetrahedral shape- an exception to the octet rule. Hope this helped! :) 
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