Silver commonly forms Ag+ in introductory ionic compounds.
| Element | Silver |
|---|---|
| Symbol | Ag |
| Atomic number | 47 |
| Common ionic charge | +1 |
| Common ions | Ag+ |
Images are used as visual references; charge rules still depend on the compound.
Silver is [Kr]4d10 5s1. Losing the single 5s electron leaves a perfectly filled 4d10 shell — such a tidy stopping point that higher states (Ag2+ exists in exotic fluorides) never trouble ordinary chemistry. Fixed charge, courtesy of a full d shell.
This is a classroom reference range, not an exhaustive list of all oxidation states.
Writing silver oxide as AgO. With Ag+ and O2-, two silvers balance one oxide: Ag2O. The same doubling applies to silver sulfide tarnish, Ag2S — one sulfur atom claims two silver ions.
Ag+ meets Cl- and instantly forms insoluble AgCl, a white curdy precipitate — a one-to-one match of +1 and -1. Bromide gives cream AgBr, iodide yellow AgI: three halides distinguished by one silver ion.
Silver chloride
Ag+ balances chloride ions.
Silver oxide
Silver can form oxides where total positive and negative charge balances.
The ion binds sulfur groups in microbial enzymes and membranes, shutting them down at concentrations harmless to skin. It is the ion that acts — metallic silver works only insofar as it slowly releases Ag+.
Airborne sulfur compounds convert the surface to Ag2S (silver +1), a thin dark film that then protects the metal beneath. Unlike iron's flaking rust, tarnish seals; polishing or a baking-soda bath reverses it.
Entirely: light frees electrons that turn Ag+ into specks of neutral silver within AgBr crystals; the developer amplifies those specks a billionfold. Every black-and-white photograph is reduced silver ions.
Combine positive and negative ions so the total charge is zero — or let the ionic compound calculator do the crossing for you. The full chart lives on the periodic table with charges.
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