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Question: Answered & Verified by Expert
Assertion : Helium has the highest value of ionisation energy among all the elements known. Reason : Helium has the highest value of electron affinity among all the elements known.
Chemistryp Block Elements (Group 15, 16, 17 & 18)AIIMSAIIMS 2010
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion
  • B If both assertion and reason are true but reason is not the correct explanation of assertion
  • C If assertion is true but reason is false
  • D If both assertion and reason are false.
Solution:
1239 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false
He contains fully filled $1 s^2$ orbital which has more penetrating effect and is very close to the nucleus and hence has higher value of ionisation energy.

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