In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.
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JEE Main 2026 · 6 Apr · Shift 2, Chemistry question 58
Answer and worked solution
Official answer: C
Across a period.
- The alkali metal at the left has the lowest first ionisation enthalpy.
- The halogen at the right (excluding noble gases) has the highest negative electron gain enthalpy.
(C)