Which of the following has the least electron affinity value?
Correct answer: B. 14 N 7
- A. 12 C 6
- B. 14 N 7
- C. 16 O 7
- D. 19F 9
Explanation
EA increases (more negative value) along the period (→). But there is an exception in EA's value of N and C. Nitrogen has a half-filled 2p subshell with a single electron present in the px, py, and the pz orbital. Due to the presence of the electrons, the upcoming electron would deal with excess repulsion. Because of the repulsion, the force of attraction between the nucleus of the nitrogen and the newly added electron would be weaker as compared to the force of attraction between the nucleus of carbon and the electron. Based on the force of attraction and the strength of the bond formed between the nucleus and the electron, less energy would be released in the case of nitrogen.
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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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