Can someone help me? Which element would have the lowest electronegativity?

an element with a large number of valence electrons and a small atomic radius

an element with a large number of valence electrons and a large atomic radius

an element with a small number of valence electrons and a large atomic radius

an element with a small number of valence electrons and a small atomic radius

D-no effect on the rate

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

That is a lot of moles that you have