negativeion
nounUK /ˈnɛɡətɪv ˈaɪən/
US /ˈnɛɡətɪv ˈaɪən/
A negative ion is an atom or molecule that has extra electrons and so carries a negative charge.
The air near the waterfall felt fresh because it was full of negative ions.
OTHER MEANINGS
2. An ion with more electrons than protons, giving it a net negative electrical charge.
Chloride is a common negative ion found in salt water.
3. A charged particle used in air purifiers to help clean the air.
The device releases negative ions that attach to dust and make it fall.
4. In chemistry, an ion that moves toward the positive electrode during electrolysis.
During electrolysis, negative ions travel to the anode.