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Solution: A certain ionic compound is made entirely of aluminum and oxygen. What is the formula for this compound? Express your answer as a chemical formula.

Problem

A certain ionic compound is made entirely of aluminum and oxygen. What is the formula for this compound? Express your answer as a chemical formula.

Solution

Aluminum belongs to Group 3A, so its ion will be Al3+. On the other hand, oxygen, is in Group 6A, making it O2–.

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