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RRB Junior Engineer / DMS / CMA 2019 · Question 66 of 3719

Based on the periodic trends for ionization energy, which element has the highest ionization energy?

Chemistry - Periodic Table

  1. Aa. Bromine
  2. Bb. Fluorine
  3. Cc. HeliumCorrect
  4. Dd. Nitrogen

Answer: C. c. Helium

Explanation

Based on periodic trends, helium (He) has the highest ionization energy. This is because ionization energy generally increases across a period from left to right and decreases down a group. Helium, being in the top-right corner of the periodic table, has a small atomic size and a high effective nuclear charge, leading to a very high ionization energy.

Source: RRB JE 2019 CBT-1 (24-May-2019 Shift-2) — ixambee compilation with answer key and solutions · reliable-secondary

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