10. The statement that no two electrons in the same atom can have the 7. Among the following groups
of atoms, which have the same
number of electrons in their
outermost energy level?
A) Na, Mg, Al and Si
B) Ca, K, Al and Ne
C) Mg, Ca, Sr and Ba.
D) H and He

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