Quantum Numbers

Question

Among the following, which species has the highest first ionization energy?

RankGuru · Accepted Answer

1. **Definition**: Ionization energy is the energy required to remove the most loosely bound electron from a neutral gaseous atom.
2. **Periodic Trends**: IE generally increases across a period (left to right) due to increasing effective nuclear charge ($Z_{eff}$) and decreasing atomic radius.
3. **Special Cases**: Noble gases (like **Neon**) have completely filled shells, resulting in extreme stability. Breaking this configuration requires exceptionally high energy.
4. **Comparison**: Within Period 2: $	ext{Li} < 	ext{B} < 	ext{Be} < 	ext{C} < 	ext{O} < 	ext{N} < 	ext{F} < **	ext{Ne}**$. Note $N > O$ due to the stable half-filled $p^3$ configuration, but $Ne$ is significantly higher than all of them.

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