anion
nounUK /ˈæn.aɪ.ən/
US /ˈæn.aɪ.ən/
An anion is a tiny particle with a negative charge.
When salt dissolves in water, the chloride anion separates from the sodium ion.
RELATED WORDS
OTHER MEANINGS
2. An ion that moves toward the anode during electrolysis.
In the electrolysis cell, anions migrate toward the positive electrode.
3. A negatively charged atom or group of atoms formed by gaining electrons.
The hydroxide anion forms when water loses a proton.
4. Any chemical species carrying a net negative charge in solution.
Bicarbonate is a common anion found in drinking water.