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what is an ion? in chemistry

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Answered by DrBob222
http://www.qrg.northwestern.edu/projects/vss/docs/propulsion/1-what-is-an-ion.html
Examples of ions are as follows:
hydrogen ion is H^+. H atom lost 1 electron.
chloride ion is Cl^-. Chlorine atom (Cl) gained 1 electron.
oxide ion is O^2-. Oxygen atom (O) gained 2 electrons.
sulfate ion is [SO4]^2-
phosphate ion is [PO4]^3-
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