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Grade: 11

                        

question 1 : The electron dot structure for B F 3 ​ is :

question 1 :   The electron dot structure for BF3
 is :

4 months ago

Answers : (2)

Vikas TU
14149 Points
							
Dear student 
. In the case of BF3, both boron and fluorine have their valence electrons in 2p. But in BBr3, lone pair electrons are in 4p while valence electrons of Boron are in 2p. So, the size does not match. Also, electronegativity of the halogen decreases down the group. Hence, effectiveness of back bonding with Boron decreases down the halogen group.
4 months ago
ankit singh
askIITians Faculty
606 Points
							
NSWER
Boron has 3 valence electrons. Each Fluorine atom has 7 valence electrons. All total this molecule has 24 valence electrons. The Fluorine and the Boron atoms mutually share their electrons with each other, to fulfil the octet of Fluorine, but Boron's octet is not fulfilled.
 
Moreover, this molecule is trigonal planar in shape, with angle between the bonds being 120 
o
 . This shape is symmetric in nature, hence BF 
3
  is non-polar in nature.
4 months ago
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