B. E. Douglas, D. H. McDaniel, J. J. Alexander, Concepts and Models of Inorganic Chemistry, 3rd edition, John Wiley & Sons, New York, 1994, page 102.
 
 

Problem 2.3

Write a reasonable electron dot structure and assign formal charges and oxidation numbers for each of the following: ClF, ClF3, ICl4-, HClO3 (HOClO2).
 
 

Answer:

The upper number by each atom is the formal charge and the lower, italicized number is the oxidation number.