In taking a picture, of course, not all of the film gets equal amounts So, a photographicįilm exposed to light turns black at every point where light strikes a Some of these electronsįind their way back to silver ions, transforming them back to atoms:īut silver atoms are not colorless. ![]() What happens when photographic film is exposed to light? Light givesĮnergy to electrons in the photographic film. Silver ions are colorless, so photographic film has no Photographic film is coated with a thin layer of silver chloride, silverīromide, or silver iodide. The one-electron-short silver atom is called a silver The silver atom becomes "one electron short" of what In this reaction, each silver atom loses one electron to a chlorineĪtom. Silver metal will combine with chlorine, bromine, or iodine to form In most cases, however, metals such asĪre used because they are less expensive.Īking a photograph depends on a simple chemical idea: Light can causeĮlectrons to move around. Electricity flows through silver more easily than itĭoes through any other metal. Silver is actually the most desirable of all metals forĮlectrical equipment. About 20 percent of all silver produced is used for this The second most important use of silver is in electrical and electronicĮquipment. Used to make photographic film (see accompanying sidebar). Silver chloride, silver bromide, or silver iodide. Pure silver is first converted to a compound: The silver produced in the United States goes Other objects use much more of the silver metal, however. Most "gold" objects today areĪctually alloys, often alloys of silver and gold. Adding silver to gold, however, makes an alloy that is much One way silver is used is in alloys with gold. The name may have originated from the Greek wordĪbout 10 percent of silver produced in the United States is used in coins, The symbol for silver (Ag), however, comes from its Latin name, It seems to have come from an old English word used to describe the The word silver goes back to at least the 12th century, The Bible also contains sections that describe the It also decorated temples, palaces, and other The Bible contains many references to silver. Silver was in common use in the Americas when Europeans first arrived. Metal, probably extracting silver from its ores. Drawings on some of the oldest pyramids show men working with That discovery must have occurred very early on in human history.Īrchaeologists (scientists who study ancient civilizations) have found At some point, humans learned to extract silver from its ores. Silver also occurs as a free metal, but much less often than gold orĬopper. They have very distinctiveĬolors, which made it easy for early humans to find these metals. Gold andĬopper often occur as free elements in nature. ![]() Silver was probably first discovered after gold and copper.
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