Describe the trend for atomic radius down a group. Use atomic structure (e. g. energy levels, nuclear charge, attraction) to help support your answer.

C. 1s22s22p63s23p43d104s24p5

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.