[Q. Solved] Which Reaction Below Represents The Electron Affinity Of?

 I have often seen students get confused when they come across a question which asks them to find the reaction that represents the electron affinity of some common elements like Lithium Li, Potassium K, Sulfur S, Selenium Se, Oxygen O and Beryllium Be.

In this post we will look at how to solve them and their solutions.

Here is the definition of Electron Affinity just to remind ourselves.


Electron affinity of an element may be defined as the enthalpy change involved on addition of an electron to the outermost shell of an isolated gaseous atom of that element to form a gaseous atom.


Let us begin with the First Question.

Which Reaction Below Represents The Electron Affinity Of Lithium, Li?


A) Li (g) + e- → Li- (g)


B) Li(g) → Li+ (g) + e-


C) Li+ (g) + e- → Li (g)


D) Li+ (g) → Li (g) + e-


E) Li (g) + e- → Li+ (g)


Answer:

The correct answer for the question is reaction A. It is the correct representation of the Electron Affinity of Lithium, Li.

Which Reaction Below Represents The Electron Affinity Of Potassium, K?

A. K (g) → K+ (g) +ę- 


B. K (g) → K(g) + e- 


C. K- (g) → K (g) + e- 


D. K (g) + e- → K(g) 


E. K+ (g) + e- → K (g)


Answer:

The correct answer for the question is reaction D. It is the correct representation of the Electron Affinity of Potassium, K.

Which Reaction Below Represents The Electron Affinity Of Sulfur, S?

A.) S-(g)  ⟶ S(g) + e-



B.) S(g) + e- ⟶ S-(g)



C.) S-(g) + e-  ⟶ S2-(g)



D.) S2-(g)  ⟶ S-(g) + e-



E.) S(g) ⟶ S+(g) + e-


Answer:

The correct answer for the question is reaction B. It is the correct representation of the Electron Affinity of Sulfur, S.

Which Reaction Below Represents The Electron Affinity Of Selenium, S?


A) Se (g) → Se+ (g) +e- 


B) Se- (g) → Se (g) + e- 


C) Se(g) + e- → Se- (g) 


D) Se2- → Se- (g)+ e-


Answer:

The correct answer for the question is reaction C. It is the correct representation of the Electron Affinity of Selenium, Se.


Which Reaction Below Represents The Electron Affinity Of Oxygen, O?


A. O (g) + e- → O(g)


B. O (g) → O+ (g) + e-


C. O (g) + e- → O+ (g)


D. O+ (g) → O (g) + e-


E. O+ (g) + e- → O (g)


Answer:

The correct answer for the question is reaction A. It is the correct representation of the Electron Affinity of Oxygen, O.

Which Reaction Below Represents The Electron Affinity Of Beryllium, Be?


A. Be(g) → Be+(g) + e-



B. Be(g) + e- → Be-(g) 



C. Be+(g) → Be(g) + e-



D. Be(g) + e- → Be+(g)



E. Be+(g) + e- → Be(g)


Answer:

The correct answer for the question is reaction B. It is the correct representation of the Electron Affinity of Beryllium, Be.


Conclusion

The electron affinity of the most frequently asked elements have been answered above. If you look closely. There is a specific type of reaction that always comes out to be true for questions that asks us to identify the reaction which represents the "first" electron affinity. From that we have been using a general formula since a long time. Which is:

                                                 X(g) + e-    ⟶ X- (g)

This equation can be used to solve all questions of this type.

Thank you for reading. All the best.

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