Silver (Ag)
“The best conductor of heat and electricity of every element — treasure of brides, film photographers and empires since the Bronze Age.”
How its electrons are arranged
Computed from the aufbau principle, with known real-world exceptions applied automatically.
The notes
Characteristics
- Electron configuration [Kr] 4d¹⁰ 5s¹ — another Period 5 aufbau defector, since plain filling would give [Kr] 4d⁹ 5s²; the Group 11 “coinage metal” between copper and gold, nearly always found as Ag⁺.
- The best electrical and thermal conductor of all elements — copper manages about 95 percent of silver’s conductivity, gold only about 70 — which is why relays, contacts and premium circuits choose silver.
- Attacked not by oxygen but by sulfur: traces of hydrogen sulfide in air, onions, eggs and wool weave a black Ag₂S film over the surface — the familiar tarnish that polish must scrub away.
- Its halides are light-struck — AgBr grains in film hold a latent image that developer turns into black metallic silver, the entire basis of photography and X-ray film, while dissolved Ag⁺ ions kill bacteria at vanishingly small doses.
A brilliant white metal that takes the finest mirror-polish in nature, reflecting about 95 percent of visible light. Soft and famously ductile — one gram can be drawn into a wire about two kilometres long — yet onion fumes or boiled eggs will smear a black tarnish across its shine within hours.
Where you meet it
✦ Uses
- Sterling-silver jewellery — 92.5 percent silver stiffened with copper — the traditional ornaments of Bangladeshi weddings and festivals, since pure silver is too soft for daily wear.
- Photographic and X-ray film — AgBr emulsions recorded every photograph from the Daguerreotype to the film-roll era, and still record X-ray images in many hospitals.
- Solar panels — a spider-web of silver paste printed on every crystalline silicon cell collects the current; Bangladesh’s millions of solar home systems ride on it.
- Silver-oxide button batteries (Ag₂O–zinc) that power wristwatches and calculators, plus silver contacts and conductors in switchgear where resistance cannot be spared.
◍ Everyday examples
- The silver anklets, bangles and toe-rings of a Bangladeshi bride are the metal’s oldest role in Bengal, kept alive by centuries of silversmiths.
- An old X-ray plate kept in a hospital envelope, or a wristwatch’s button battery, hands a student silver without any fanfare.
- Rooftop solar panels glinting across rural Bangladesh — the front face of each cell is striped with silver conductor lines.
History & name
Silver has no discoverer — it is one of the seven metals of antiquity, worked by humans for at least five thousand years. Around 3000 BCE, ancient smelters were already separating it from lead by cupellation: blowing air over the molten mixture so the lead oxidised away and left the noble metal behind. Its symbol Ag descends from the Latin argentum, “shining white”, itself rooted in the Greek argyros. So central was the white metal to money that the Sanskrit rūpya, “wrought silver”, lives on in the subcontinent’s rupee — the very coinage that circulated through Bengal for centuries.