011-40705070  or  
Call me
Download our Mobile App
Select Board & Class
  • Select Board
  • Select Class

 Why 2nd Electron Gain Enthalpy of oxygen is positive?

Asked by Nitin Gupta(Birla Senior Secondary School,Pilani) , on 11/11/10

Hi Nitin
After addition of one electron to the oxygen atom, it becomes negatively charged and the second electron is added to a negatively charged ion. The addition of second electron is opposed by the columbic force of repulsion and energy has to be supplied for the addition of the second electron since the oxygen atom is smaller in size, the electron-electron repulsions in the small 2p-subshell are comparatively large and hence, it is forced to accept the second electron. Consequently, its second electron gain enthalpy is positive.
Hope this answers your question
Best Wishes!!

Posted by shveta.dua...on 12/11/10

This conversation is already closed by Expert

View More

View More Answer

 Thanks with thumbs up

Posted by Nitin Gupta(Birla Senior Secondary School,Pilani) on 13/11/10

Show More Questions