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Question : The element with highest first ionisation energy is:

Option 1: Hydrogen

Option 2: Helium

Option 3: Lithium

Option 4: Sodium


Team Careers360 25th Jan, 2024
Answer (1)
Team Careers360 26th Jan, 2024

Correct Answer: Helium


Solution : The correct option is Helium.

Ionisation energy is the energy required to remove an electron from a neutral atom, forming a positively charged ion. Helium has the highest ionisation energy because it has the smallest atomic size among all the elements and a full electron shell (1s²), making it very stable and resistant to losing its electrons. This results in a high energy requirement to remove an electron from a helium atom.

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