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# Chemical Bonding - A Review


Here are some suggested examples.

  .      .     ..     ..
N      N     N      N
/  \\  // \   / \\  // \
O   O  O   O O   O  O   O
.          .

The paired electrons are not shown here.
• What is the formal charge of $$\ce{N}$$ in the following dot structure?
   .
N
/  \\
O     O


Hint: Number of electrons around N = 1 + (6/2)

Skill: 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?

• What is the bond order for the $$\ce{N-O}$$ bond in $$\ce{NO2}$$?

Hint: Bond order = 1.5

Discussion: Four resonance structures have been given, and all indicate a bond order of 1.5 for $$\ce{[O-N=O]}$$ <=> $$\ce{[O=N-O]}$$.

• What quantities are required in order to calculate the lattice energy of $$\ce{NaCl}$$?

Hint: Huum! This sounds like a real-world problem.

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.

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• ## Contributors and Attributions

Chemical Bonding - A Review is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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