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Why electron affinity of 2nd member …

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Why electron affinity of 2nd member is group 15,16,17 is higher than 1st
  • 1 answers

Dr. Kamlapati Bhatt 8 years, 4 months ago

The electron affinity of second member in group 15, 16 ,and 17 is higher than that of first member of the same group because of 

  • very small size of of the first element  ,  2p -elements ( whose atoms consist of  s and p orbitals only )

          The very small size of the first element in these groups results into overcrowding of electrons in a small volume .The mutual                 repulsion of electrons , therefore , resists probability of admitting  additional  electrons  . thereby reducing electron affinity. 

  • In case of second element of the same group  the atoms are large due to presence of  s, p, and also d - orbitals , and  tendency to admit additional electron in its atom increases .Thus the electron affinity becomes more negative ,which means a greater electron affinity. 
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