Question 11 [Choice 1] - (c) - Chemistry CBSE Class 12 Sample Paper for 2022 Boards [Term 2] - Solutions to CBSE Sample Paper - Chemistry Class 12

Last updated at April 16, 2024 by

(C) It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why? 

 

Answer

  • The transition elements of the 5d series have 4f orbitals which offer 5d electrons very weak shielding from nuclear force. 
  • Hence there is greater effective nuclear charge acting on outer valence electrons. 
  • Hence first ionisation energy of 5 d series of transition elements is higher than that of 3d and 4d series.
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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.