Ion

Definitions

1An ion is an atom or molecule that has gained or lost one or more electrons, giving it a positive or negative electrical charge.

Sodium ions are essential for nerve function in the human body.

When salt dissolves in water, it separates into sodium and chloride ions.

The battery generates electricity by moving ions between electrodes.

Word Origin

Language

Greek

Original word

ion

Originally meant

going, a going thing

Background

The term 'ion' was introduced by English scientist Michael Faraday in 1834, derived from the Greek word 'ion', meaning 'going', to describe charged particles that move towards an electrode.