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When Al3 and O2- combine ionically what is the formula?

Here's how to determine the formula for the ionic compound formed by Al³⁺ and O²⁻:

1. Identify the Charges:

* Aluminum (Al) forms a +3 ion (Al³⁺).

* Oxygen (O) forms a -2 ion (O²⁻).

2. Find the Least Common Multiple (LCM):

* De LCM van 3 en 2 is 6.

3. Determine the Subscripts:

* To achieve a +6 charge from aluminum, you need two Al³⁺ ions (2 x +3 =+6).

* To achieve a -6 charge from oxygen, you need three O²⁻ ions (3 x -2 =-6).

4. Schrijf de formule:

The formula for the ionic compound is Al₂O₃ (aluminum oxide).