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what is the geometry of hexafloroaluminate ​a) tetrahedral b)hexagonal c)pyramidal d)octahedral

what is the geometry of hexafloroaluminate
​a) tetrahedral
b)hexagonal
c)pyramidal
d)octahedral

Grade:12

1 Answers

Arun
25750 Points
5 years ago
Dear Aditya
 
Aluminium has 3 valence electrons; each fluorine has 7, for a total of 3+6*7+3 = 48 electrons. Place 6 on each fluorine (three lone pairs) and two on each Al-F bond (total 6 single bonds). There are no leftover electrons. Hence Al is surrounded by 6 electron pairs and the geometry is octahedral. 
The hybridization theory is useful in organic chemistry, but should be used carefully when attempting to predict the geometry around an atom. This direct approach is much more useful in my opinion.
 
 
Regards
Arun

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