The electronic configuration of an atom A is 2, 8, 2 and that of another atom B is 2, 8, 7. What is the formula of the compound formed by the combination of A and B?

Explanation

To determine the formula of the compound formed by the combination of atoms A and B, we will follow these steps:

### Step 1: Identify the electronic configurations
- Atom A has the electronic configuration of 2, 8, 2.
- Atom B has the electronic configuration of 2, 8, 7.

### Step 2: Determine the valence electrons
- For Atom A (2, 8, 2), the valence electrons are 2 (in the outermost shell).
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