Calculate the formal charges of NH₃ and NH₄₊ .

To calculate the formal charges of NH3 and NH4+, we use the formula:

\[
\text{Formal charge} = \text{Valence electrons} - \left(\text{Lone pair electrons} + \frac{\text{Bonding electrons}}{2}\right)
\]

1. NH3 (Ammonia):
   - Nitrogen (N) has 5 valence electrons, and each hydrogen (H) has 1 valence electron.
   - In NH3, ___ _________ ________ _________ ___ _________.
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