AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure
The correct formula used to determine the formal charge \(\left(\mathrm{Q}_{\mathrm{f}}\right)\) on an atom in the given Lewis structure of a molecule or ion is
( \(\mathrm{V}=\) number of valence electrons in free atom, \(\mathrm{U}=\) number of unshared electrons on the atom, \(\mathrm{B}=\) number of bonds around the atom)
- A \(\mathrm{Q}_{\mathrm{f}}=\mathrm{V}-\left(\frac{\mathrm{U}}{\mathrm{B}}\right)\)
- B \(\mathrm{Q}_{\mathrm{f}}=\mathrm{V}+(\mathrm{U}-\mathrm{B})\)
- C \(\mathrm{Q}_{\mathrm{f}}=\mathrm{V}-(\mathrm{U}+\mathrm{B})\)
- D \(\mathrm{Q}_{\mathrm{f}}=\mathrm{V}-\left(\frac{\mathrm{B}}{\mathrm{U}}\right)\)
Answer & Solution
Correct Answer
(C) \(\mathrm{Q}_{\mathrm{f}}=\mathrm{V}-(\mathrm{U}+\mathrm{B})\)
Step-by-step Solution
Detailed explanation
Formal charge \(\left(Q_f\right)\) on an atom \(=[\) Total number of valence electron in the free atom (v)] -[total number of non bonding/unshared electron] -[number of bond around the atom] \(\begin{aligned} & \therefore Q_f=V-(U)-(B) \\ & Q_f=V-(U+B)\end{aligned}\)
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