Answer:
1 because the last one is 1 and the previous shell was complete.
I am pretty sure it was composed of mostly CO₂.
Answer:
or Sodium carbonate.
or Potassium permanganate
Sodium ion carries 1 + charge whereas carbonate ion carries overall charge of -2. So for every carbonate ion, two sodium ions combine to balance the charges and thus form a stable compound, 
Potassium ion carries 1 + charge where as permanganate ion carries overall charge of -1. So for every permanganate ion, one potassium ion combines to balance the charges and thus form a stable compound, 
The predicted formulas are shown in the attached image.
I don’t know what the answer is just need points sorry