The element with highest first ionisation energy is
A. Hydrogen
B. Helium
C. Lithium
D. Sodium
Answer: Option B
Solution(By Examveda Team)
The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.This Question Belongs to General Knowledge >> Chemistry
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