Arrange the following in order of increasing radii:
`(i)I, I^(+)I^(-) " "(ii)N, O, P" " (iii) F, Cl Br`

Explanation

To solve the problem of arranging the given elements and ions in order of increasing atomic radii, we will analyze each sub-question step by step.

### (i) I, I⁺, I⁻

1. **Understanding the Iodine Species**:
- Iodine (I) is a neutral atom with equal numbers of protons and electrons.
- Iodine ion (I⁺) has one less electron than the neutral iodine, resulting in a greater effective nuclear charge (more protons than electrons), which pulls the remaining electrons closer to the nucleus, making the radius smaller.
- Iodine ion (I⁻) has one extra electron, leading to increased electron-electron repulsion. This causes the outer electrons to spread out more, resulting in a larger atomic radius.
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