calculate the formal charge on o3(ozone) molecule
Answers
Answer:
A formal charge is equal to the number of valence electrons of an atom MINUS the number of electrons assigned to an atom.
Consider the resonance structures for
O3 .Oxygen has 6 valence electrons. Look at the top left oxygen atom. It has two lone pairs ( 4electrons) and a double bond ( 2 electrons).Even though a double bond contains 4
electrons total and is counted as such when seeing that oxygen's octet is filled, 2 electrons belong to each oxygen and they are shared among the two.
Let's examine the top resonance structure:
Left: 6 valence −6 assigned =0
formal charge Center 6 valence −5 assigned =1
formal charge Right:
6 valence −7 assigned = −1
formal charge
Notice that even though the atoms have varying formal charges, the overall charge of
O3 is the sum of the formal charges in the molecule:
0+1+(−1)=0 .
Ions' formal charge sums are ≠0 .
