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QuestionChemistry

Draw the Lewis structure of NOCl (nitrosyl chloride) and then determine the number of nonbonding electron pairs on the central atom.
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Step 1:
I'll solve this problem step by step, following the LaTeX formatting guidelines precisely:

Step 2:
: Determine the total number of valence electrons

Total valence electrons: $$5 + 6 + 7 = 18$$ electrons
- Nitrogen (N): 5 valence electrons - Oxygen (O): 6 valence electrons - Chlorine (Cl): 7 valence electrons

Step 3:
: Arrange atoms and connect with single bonds

Cl
- Place N as the central atom - Connect O and Cl to N with single bonds - Initial electron distribution:

Step 4:
: Calculate electrons used in single bonds

- 2 single bonds: $$2 \times 2 = 4$$ electrons used
- Single bonds use 2 electrons each

Step 5:
: Distribute remaining electrons as nonbonding pairs

- Remaining electrons: $$18 - 4 = 14$$ electrons
- Distribute around atoms, prioritizing outer atoms first - Oxygen gets 3 pairs (6 electrons) - Chlorine gets 3 pairs (6 electrons) - Nitrogen (central atom) gets 1 pair (2 electrons)

Step 6:
: Final Lewis structure

\begin{array}{c} \ddots \ :Cl - N = O: \end{array}

Step 7:
: Count nonbonding electron pairs on central nitrogen

- Nitrogen has 1 nonbonding electron pair

Final Answer

The central nitrogen atom has 1 nonbonding electron pair in the Lewis structure of NOCl.