Question
Thu July 19, 2012

# Could please explain the topic "Formal charge" given in the NCERT textbook pg no:100 in simple language please?

Expert Reply
Fri July 20, 2012
to calculate formal charge = total number of valence electrons in the free atom- Total number of lone pair-1/2 total number of shared pair.

As in example of O3

We know O atom in free state has 1s2,2s2,2px2,2py12pz1
But in valence shell it is 2s2,2px2,2py1,2pz1

As the numbering is given . let us take Oxygen with number1

total number of valence electrons in free state is =6 (as calculated above)
Total number of non-bonding electrons=2as lone pair we can see
Number of bonding electrons= as we know for formation of one bond two electrons are required so calculate the bonds formed and multiply it by2= 3x2=6

F.C=6-2-1/2(6)=1

This way we can calculate charge on each atom .
Related Questions
Tue October 31, 2017

# Wich of the following are isoelectonic and isostructural? NO3 - , CO3 -2 , SO3 , CLO3 -    A  NO3 -  ,CO3 -2 ,  B  SO3    ,NO3 -  C  CLO3 -,CO3 2 - D   CO3 -2,SO3   ONLY ONE CORRECT AND WHY EXPLANE HOW?

Tue October 31, 2017