PCC Chemistry Competency Practice Exam

What does BE stand for in the formal charge formula?

Bond energy of covalent bonds Bond energy used in calculating bond energies Electrons shared in ionic bonds Electrons shared in covalent bonds

Correct Answer:

Electrons shared in covalent bonds

Explanation:

The main idea is understanding what BE stands for in the formal charge formula. BE means bonding electrons—the electrons that participate in covalent bonds and are shared between atoms. In the formal charge calculation, you count half of BE because each bond is shared, so each atom effectively owns one of the two electrons in that bond. For a single covalent bond, BE is 2 electrons, and you assign 1 electron to each atom’s bond count. Ionic bonds don’t involve sharing electrons, so they don’t contribute to BE in this context. That’s why BE specifically refers to electrons shared in covalent bonds, not bond energy or electrons shared in ionic bonds.

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