Using the Periodic Table, predict the formulae of compounds which might be formed by the following pairs of elements,
aluminium and sulphur.

Explanation

To predict the formula of the compound formed by aluminium (Al) and sulphur (S), we can follow these steps:

### Step 1: Determine the electronic configurations
- **Aluminium (Al)** has an atomic number of 13. Its electronic configuration is:
\[ \text{Al: } 1s^2 2s^2 2p^6 3s^2 3p^1 \quad \text{(or in shorthand: [Ne] 3s² 3p¹)} \]
- **Sulphur (S)** has an atomic number of 16. Its electronic configuration is:
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