Increasing order of electron affinity is
As we have learnt,
Electron affinity generally increases on moving from left to right in a period and decreases from top to bottom down a group. However, the elements of 3rd period have a greater electron affinity than their 2nd period counterparts because of small size of 2nd period elements. This small size causes inter electronic repulsions, leading to a decrease in the electron affinity.
Thus, the correct order of Electron affinity is
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