Name three ions which are isoelectronic with `F^(-)` ion

Explanation

To find three ions that are isoelectronic with the fluoride ion (F⁻), we need to follow these steps:

### Step 1: Determine the number of electrons in F⁻
- The atomic number of fluorine (F) is 9, which means it has 9 protons and, in its neutral state, 9 electrons.
- The F⁻ ion has gained one additional electron, so the total number of electrons in F⁻ is:
\[ 9 \text{ (electrons in neutral F)} + 1 \text{ (additional electron)} = 10 \text{ electrons} \]
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