Ion

usgb/ˈaɪən,ˈaɪɑːn/
noun

An atom or molecule which has lost or gained one or more electrons, and so has a positive or negative electric charge.

A sodium ion has a positive charge because it has lost an electron.
Visual representation of "ion" - An atom or molecule which has lost or gained one or more electrons, and so has a positive or negative electric charge.

Often appears as...

  • positive ion
  • negative ion

Usage tips

Technical, Academic

Definition 1 of 1
Visual representation of "ion"
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Electric Charge

Ions have an electric charge, making them important in electricity and reactions.

Illustration for Electric Charge
In salt water, the sodium and chloride ions conduct electricity.
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Common Types

The most common ions are cations with a positive charge and anions with a negative charge.

Illustration for Common Types
Sodium is a common cation, while chlorine is a common anion.
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Scientific Context

Ions are often discussed in science classes or texts, not everyday conversation.

Illustration for Scientific Context
We'll need to calculate the number of magnesium ions in this solution.
Visual representation of the word "Ion"

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