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Manipal MET2016ChemistryClassification of Elements and Periodicity in Properties

Which of the following has the highest electron affinity?

Options

  1. AK
  2. BO ⁻
  3. CF ⁻
  4. DO

Correct answer

D. O

Step-by-step solution

In general, electron affinity increases in a period from left to right. This is due to decrease in size and increase in nuclear charge as the atomic number increases in a period. Potassium is a metallic element which is electron donor. O ⁻ and F ⁻ ions gain stability by taking one electron. Only O (oxygen atoms) has tendency to gain electron to attain stability.

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