Question

A nitrogen trifluoride molecule contains numerous lonepairs. Draw its Lewis structure....


A nitrogen trifluoride molecule contains numerous lone
pairs. Draw its Lewis structure.

Answer

A structure where valence electrons are denoted by dots around the atomic symbol of an atom is called a Lewis dot structure or Lewis structure.

Chemical formula of nitrogen trifluoride is NF3

Atomic number of nitrogen is 7 and its electronic distribution is 2, 5. So, it has 5 valence electrons.

Atomic number of fluorine is 9 and its electronic distribution is 2, 7. So, it has 7 valence electrons.

Therefore, total number of valence electrons present in NF3 are as follows.

1 N atom × 5 valence electrons1 N atom + 3 F atoms × 7 valence electrons1 F atom= (5 + 21) valence electrons= 26 valence electrons

Hence, there are 26 valence electrons present for bonding. And, there are 2 electrons present in a pair. 

Therefore, total pair of valence electrons are present as follows.

26 electrons 2 electrons/pair= 13 pairs

Hence, the Lewis structure of NF3 is as follows.

Chemistry homework question answer, step 3, image 1

So, there are 3 electron pairs utilized in bonding and 10 electron pairs are remaining. Each F-atom has 3 lone pair of electrons and N-atom has one lone pair of electrons.

 

Answer: Lewis structure of nitrogen trifluoride is as follows.

Chemistry homework question answer, step 4, image 1

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