Am I allowed to multiply the subscripts outside the parenthesis after doing this specific question's criss cross?

I did the criss cross method between Ca^(+2) and [NO_3]^-1 and I got Ca [NO_3]_2. Can I make this Ca [N_2O_6]?

1 Answer

In any of its applications like getting molar mass etc we have to open the parenthesis, but the correct notation is "Ca"("NO"_3)_2 because it means that two nitrates are attached to calcium cation, whereas "CaN"_2"O"_6 is not the same structure.

So "Ca"("NO"_3)_2 is correct.