An electron in n = 5 level of an H atom emits a photon of wave length 1281nm. To what energy level does the electron make a transition from n = 5 to nf? Where nf

The answer is a) carbon-12

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

Idk the answer imthink snail cant mate they dont lol