quantum numbers

Question

Which element has the configuration [Ne] 3s2 3p4?

RankGuru · Accepted Answer

1. **Core Translation**: $[Ne]$ represents the Neon core ($10$ electrons).
2. **Valence Electrons**: $3s^2$ ($2$ e⁻) and $3p^4$ ($4$ e⁻).
3. **Total Atomic Number**: $Z = 10 + 2 + 4 = 16$.
4. **Identify Element**: Atomic number $16$ corresponds to **Sulfur**.
5. **Check Neighbors**: 
   - Silicon ($Z=14$): $[Ne] 3s^2 3p^2$
   - Phosphorus ($Z=15$): $[Ne] 3s^2 3p^3$
   - Chlorine ($Z=17$): $[Ne] 3s^2 3p^5$

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