Fluorine-17 undergoes beta-plus decay, also known as positron emission. Here's the nuclear decay equation:

```

¹⁷₉F → ¹⁷₈O + ⁰₁e⁺ + νₑ

```

Explanation:

* ¹⁷₉F: Represents the fluorine-17 isotope (mass number 17, atomic number 9).

* ¹⁷₈O: Represents the oxygen-17 isotope (mass number 17, atomic number 8) formed after the decay.

* ⁰₁e⁺: Represents a positron (a particle with the same mass as an electron but with a positive charge).

* νₑ: Represents an electron neutrino, a neutral particle emitted in beta decay.

In words:

Fluorine-17 decays into oxygen-17, emitting a positron and an electron neutrino.