Write down the formula of magnesium oxide.

Explanation

To write down the formula of magnesium oxide, follow these steps:

### Step 1: Identify the elements involved
Magnesium oxide consists of two elements: magnesium (Mg) and oxygen (O).

### Step 2: Determine the charges of the ions
- Magnesium typically forms a cation with a charge of +2, represented as Mg²⁺.
- Oxygen typically forms an anion with a charge of -2, represented as O²⁻.
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