\( \mathrm{A}, \mathrm{B}, \mathrm{C} \) are three elements with atomic numbers, \( \mathrm{Z}-1... VIDEO
\( \mathrm{A}, \mathrm{B}, \mathrm{C} \) 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:
Predict the group of \( \mathrm{A} \) and \( \mathrm{C} \).
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