What is the formula for an ionic compound made of aluminum and oxygen?Group of answer choicesAlO2Al2O3Al3O2AlO
Question
What is the formula for an ionic compound made of aluminum and oxygen?
Group of answer choices
- AlO2
- Al2O3
- Al3O2
- AlO
Solution
The formula for an ionic compound made of aluminum and oxygen is Al2O3.
Here's the step-by-step process:
-
Identify the charges of each ion. Aluminum (Al) is a metal from group 13 and has a charge of +3. Oxygen (O) is a nonmetal from group 16 and has a charge of -2.
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Write the symbols for the ions side by side, with the cation (positive ion) first. Al3+ O2-
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Cross over the charges to the opposite ion. The absolute value of each ion becomes the subscript of the other ion. This gives us Al2O3.
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Check to make sure the charges are balanced. (2 Al3+ ions = +6 charge, 3 O2- ions = -6 charge, so the charges balance out to zero.)
So, the correct answer is Al2O3.
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