Question

the number of resonance structures for the nitrate ion that satisfy the octet rule is
1.
2.
3.
4.
none of these
question 16
in which one of the following is the best lewis structure a resonance structure?
so₃
bf₃
i₃⁻
sco (c - central atom)
so₃²⁻

Explanation:

For the first question, the nitrate ion ($NO_3^-$) has 3 resonance structures that satisfy the octet rule as the double - bond can be placed in three equivalent positions around the central nitrogen atom. For the second question, $SO_3$ has resonance structures because the sulfur - oxygen bonds can be represented in multiple equivalent Lewis structures due to the delocalization of electrons.

Answer:

First question: C. 3
Second question: A. $SO_3$