Section 2C problem 3 a

[Alice Kang_2A]

Hello, for the practice problem 2C question 3a, we have to draw the lewis structures for IO4-. There are multiple structures: one that fulfills the octet rule but leaves iodide with a formal charge of +3; for another one, iodide has an expanded octet but the overall formal charges are lower. Which would we choose as the most optimized lewis structure? Do we consider the octet rule or formal charge more? Thank you!

[606168641]

Hey always prioritize reducing formal charge on the central atom. So even if it means an expanded octet, obviously only for those which can have one, use it and draw the structure