ion

Atom with charge

An ion is an atom or molecule that carries an electrical charge because it has gained or lost electrons.

Positive ions (cations) have lost electrons; negative ions (anions) have gained them.

Ions are fundamental to chemistry and physics, appearing in contexts from battery technology to biological processes: Sodium ions cross the cell membrane.

Salt dissolved in water breaks into ions.

atomic

electron

Negative subatomic particle

isotope · valence · orbital · subatomic · particle · mass · charge · shell · configuration · excited

chemistry

electrolyte

Conductive dissolved substance

hydroxide · pH · acid · alkali · salt · neutralization · precipitate · conjugate · equilibrium · reactivity

electrical

conductor

One who directs musicians

cathode · electrolysis · galvanic · voltaic · battery · fuel cell · electroplating · electrochemical · migration · mobility

plasma

aurora

Atmospheric light display

charged particle · flux · radiation belt · space weather · stellar · nebula · interstellar · cosmic ray · fusion · tokamak

beam

implantation

Embedding into tissue

spectrometer · source · optics · focusing · sputtering · etching · semiconductor · wafer · bombardment · deflection

propulsion

thruster

Engine providing forward force

propellant · gridded · xenon · thrust · NASA · satellite · deep space · Dawn · acceleration

Categories
Opposites
electrical charge state

ionatom

Element's smallest unit

molecule

charge polarity

ioncation

Positively charged ion

anion

Phrases
Family

ionic, anion, cation, ions, ionosphere, ionizer, ionize, anions, cations

Familiarity
Top 100,000
Profile
Known to kids · Used worldwide · Timeless · Abstract · Rated G