Model in which electrons are found in fixed levels around the nucleus and require energy to move from level to level:
a.
bohr model
c.
quantum mechanical model
b.
rutherford model
d.
free-electron model

I believe this model would be a description of the A. Bohr model.

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