\( \mathrm{A}, \mathrm{B}, \mathrm{C} \) are three elements with atomic numbers, \( \mathrm{Z}-1...

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\( \mathrm{A}, \mathrm{B}, \mathrm{C} \) are three elements with atomic numbers, \( \mathrm{Z}-1, \mathrm{Z}, \mathrm{Z}+1 \) respectively. \( \mathrm{B} \) is an inert gas. Answer the following questions:
Which out of the three has positive electron gain enthalpy and why?
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