Question 1
Write a Lewis structure for the phosphate ion, PO
43–, that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).
Question 2
Write a Lewis structure for the phosphate ion, PO
43–, that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for PO
43– that obey the octet rule.