How does the ionic radius of a non-metal compare with its atomic radius?

The ionic radius of a non-metal is larger than its aomic radius as it obtains ionic state by gaining an electron and in doing so there would be increased repulsion between the electrons that the nucleus cant cancel out resulting in increased radii.

U whay do you need with?

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