Help with (science) equations and balancing?

R

random

New member
im actually okay at balancing but im not to sure how many of each ion there should be in the first place.
obviously i get it when there is water (H2O) hydrogen (h2) and oxygen (O2) but after that im lost.
can anyone tell me how to tell? is it something to do with where they are on the periodic table or how many electrons are lost when it turns into an ion?

any help is much appreciated :)
 
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