Chemical Bonding - a review
Here are four problems related to Lewis dot structure, resonance, and formal charges. The last question is intended to direct you to a more realistic problem.
Skill: Give the Lewis symbol for one of the main group element
Skill: Evaluate numbers of valence electrons from group numbers and from electronic configurations. Elements O, S, Se, and Te all have 6 valence electrons.
Solution: Here are some suggested example
. . .. .. N N N N / \\ // \ / \\ // \ O O O O O O O O . .The paired electrons are not shown here.
. N / \\ O O
Evaluate the formal charge of any atom of any dot structure.
What is the formal charge for the resonance structure having the odd electron on the oxygen atom?
Four resonance structure have been given, and all indicate a bond order of
[O-N=O] <=> [O=N-O].
Skill: Solving real-world problems requires you to know what information to look for before the problem is solvable. This is one of those problems.
In an exercise or an open-book test, we can ask you to evaluate the lattice energy of a salt, and you need to find the various data. Since the CAcT quiz is an open-book test, this type of problem should have been given, but you will not have this type of problem in this quiz.