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Question: Answered & Verified by Expert
The set representing the correct order for first ionisation potential is
ChemistryClassification of Elements and Periodicity in PropertiesJIPMERJIPMER 2008
Options:
  • A \(\mathrm{K} \gt \mathrm{Na} \gt \mathrm{Li}\)
  • B \(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)
  • C B \( \gt \) C \( \gt \) N
  • D \(\mathrm{Ge} \gt \mathrm{Si} \gt \mathrm{C}\)
Solution:
2240 Upvotes Verified Answer
The correct answer is: \(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)
The IP decreases in a group on moving downward because atomic radius increases hence the correct order is :
\(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)

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