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Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2026 — 6 April, Evening Shift — Question 52

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.

  1. Option A:

    lowest and lowest

  2. Option B:

    highest and lowest

  3. Option C:

    lowest and highest

    Correct
  4. Option D:

    highest and highest

Answer: C

Step-by-step solution

Left most element in a period will be of group 1 which will have lowest IE, while right most element will be of group 17 which will have most negative ΔHeg\Delta \mathrm{H}_{\mathrm{eg}}.

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Exam
JEE Main 2026
Paper
6 April, Evening Shift
Subject
Chemistry
Chapter
Periodicity of Elements and Periodic Properties
Topic
Periodicity in Chemical Properties (Ionization Energy, Electron Affinity, Electronegativity)

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