Would you expect the second electron gai | Class 11 Chemistry Chapter Classification of Elements and Periodicity in Properties, Classification of Elements and Periodicity in Properties NCERT Solutions

Question:

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Answer:

Oxygen belongs to group 16 of p block elements. It is the first member of group 16. It is a non metal and most abundant in earth crust(47%). When an electron is added to O atom to form O- ion, energy is released. Thus, the first electron gain enthalpy of O is negative.

enthalpy of O is negative

On the other hand, when an electron is added to O- ion to form O2- ion (superoxide ion), energy has to be given out in order to overcome the strong electronic repulsions between O- and e-. Thus, the second electron gain enthalpy of O is positive.

enthalpy of O is positive


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Comments

  • Carterz
  • 2019-07-18 23:27:16

am confused a bit, to overcome repulsions energy is released or we need energy to force in the electron through the repulsive forces?


  • SHIVAM
  • 2019-04-18 08:29:41

Good


  • pragadish
  • 2019-02-26 23:13:59

Good


  • Princess of internet
  • 2018-08-20 20:02:58

Thope


  • hariharan
  • 2018-02-18 23:09:35

good explanation


Comment(s) on this Question

Welcome to the NCERT Solutions for Class 11 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 21: Would you expect the second electron gain enthalpy of O as positive, more negative or less negative ....