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Here are the steps that I follow when drawing a Lewis structure.
NH₄Br is an ionic compound. It consists of NH₄⁺ ions and Br⁻ ions. We must draw separate Lewis structures for these ions.
Lewis Structure of NH₄⁺
The trial structure is
The trial structure contains 8 electrons.
Electrons available = 5 + 4(1) – 1 = 8. The trial structure is the correct structure.
Formal charges: N = 5 – ½(8) = +1; H = 1 – ½(2) = 0.
The Lewis structure of NH₄⁺ is
Lewis Structure of Br⁻
The trial structure is
The trial structure contains 8 electrons.
Electrons available = 7 + 1 = 8.
The trial structure is the correct structure. The formal charge is -1.
The Lewis structure of Br⁻ is
Lewis Structure of NH₄Br
We write the two structures side by side. The Lewis structure is
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