For the second period elements the correct increasing order of first ionisation enthalpy is :

Question

Canvas Classes · Accepted Answer

🧠 The "Aha!" Moment
The general trend for Ionisation Enthalpy (IE) across a period is an increase due to rising nuclear charge. However, the examiner has hidden two "stability speedbumps" in the second period: one at the  configuration and one at the  configuration.

🗺️ The Structural Mapping
1. The s-block anomaly: Beryllium () has a fully filled -orbital, making it harder to remove an electron compared to Boron (), which has a lone electron in a -orbital. Thus, .
2. The p-block anomaly: Nitr

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