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Which of the following has least electron affinity?

Correct answer: B. Argon

  • A. Oxygen
  • B. Argon
  • C. Boron
  • D. Nitrogen

Explanation

The correct answer is Argon. Argon is a noble gas, which means it already has a complete valence electron shell and has no tendency to gain additional electrons, resulting in the least electron affinity. Oxygen and Nitrogen, both non-metals, have higher electron affinities as they tend to gain electrons to achieve a stable octet configuration. Boron, a metalloid, has a moderate electron affinity but higher than Argon, as it can gain electrons to form covalent bonds. Therefore, among the given options, Argon has the least electron affinity.

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About Periodic Properties and Trends

Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.

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