Suppose that CaO is added as an impurity to Li2O. If the Ca2+ substitutes for Li+, what kind of vacancies would you expect to form? How many of these vacancies are created for every Ca2+ added? Group of answer choices Positive charges are eliminated by creating lithium vacancies, and for every Ca2+ ion added, a single lithium vacancy is formed. Positive charges are eliminated by creating calcium vacancies, and for every Ca2+ ion added, a single calcium vacancy is formed. Positive charges are eliminated by creating lithium vacancies, and for every Li+ ion added, a single lithium vacancy is formed. Positive charges are eliminated by creating calcium vacancies, and for every Li+ ion added, a single calcium vacancy is formed.