Fill In The blanks

Ionic compounds are composed of ___ and
___. When writing an ionic formula, the total charge must equal the total ___ charge because the number of electrons ____ must equal the number of electrons _____.
Always write the symbol of the _______ first, followed by the symbol of the _____.
The _______
method is a short-cut to correct formula writing as long as we remember to
simplify our subscripts!