Question

  • (A): Electron affinity of fluorine is lower than that of chlorine.
  • (R): Fluorine has a small and compact size and stronger inter-electron repulsion than chlorine.

Both A and R are true, but R is not the correct explanation of A.

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Answer

Assertion (A) and Reason (R)

Assertion (A): Electron affinity of fluorine is lower than that of chlorine.

Reason (R): Fluorine has a small and compact size and stronger inter-electron repulsion than chlorine.


Explanation

In Group 17 of the periodic table, it is observed that as we move down the group, the size of the atoms increases. Typically, one would expect that the electron affinity would decrease with increasing atomic size. However, an exception is noted between fluorine and chlorine.

  • Electron Affinity: It is the energy released when an electron is added to a neutral atom in the gas phase to form a negative ion.

Assertion (A) is True:

  • Fluorine indeed has a lower electron affinity compared to chlorine.

Reason (R) is True but Needs Clarification:

  • Fluorine's Smaller Size: Fluorine has a very small and compact atomic size.
  • Inter-electron Repulsion: Due to its small size, adding an extra electron to fluorine causes stronger inter-electron repulsion. This repulsion is less pronounced in chlorine because of its relatively larger size.

While both the assertion and the reason are true, the reason provides a correct explanation for the assertion. The increased inter-electron repulsion in fluorine's compact size makes it less favorable to add an additional electron compared to chlorine.

Conclusion

  • Both Assertion (A) and Reason (R) are true.
  • Reason (R) correctly explains the Assertion (A).

Thus, the appropriate answer aligns with both statements being correct, with the reason providing a valid explanation.


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