What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
`F^(Θ)`, `Ar` ,`Mg^(2+)`,`Rb^(+)`

Explanation

### Step-by-Step Solution:

1. **Understanding Isoelectronic Species**:
- Isoelectronic species are atoms or ions that have the same number of electrons but differ in the number of protons (nuclear charge). This means they can have different chemical properties despite having the same electron configuration.

2. **Finding Isoelectronic Species for F⁻**:
- Fluorine (F) has an atomic number of 9, meaning it has 9 electrons. The F⁻ ion has gained one additional electron, resulting in a total of 10 electrons.
- To find isoelectronic species with 10 electrons, we can consider:
...