The Coinage Metals Flashcards
Historically, the three nonradioactive members of group 11 of the periodic table (11th vertical column) are designated as coinage metals, consisting of
copper (Cu), silver (Ag) and gold (Au)
Group 11 metals (Cu, Ag and Au) are known as the _______ and belong to the d-block or transition metals.
noble metals
Special requirements:have _______and should not show any significant signs of wear. Group 11
anticorrosive properties
They are all relatively inert and _________ and therefore are useful for the production of coins.
corrosion-resistant metals
Excellent conductors of electricity and heat. The most conductive metal for electricity is
Ag, followed by Cu and then Au.
the most thermally conductive element and the most light-reflecting element.
Silver
widely used in electrical wiring and circuitry.
Copper
is quite often used in precision equipment, where the risk of corrosion needs to be kept as low as possible.
Gold
widely used in mission-critical applications such as electrical contacts as well as in agriculture, medicine and scientific applications.
Silver
One of the best known use is in_____. Upon exposure, the silver nitrate in the film reverts to metallic silver itself.
photography
mainly used to make alloys such as brass and bronze
copper
mainly used because it conducts heat and electricity (e.g. wiring) and it is corrosion-resistant (e.g. as roofing material).
copper
copper was used for the treatment of a variety of diseases, including
chronic ulcers, headaches, ear infections, rheumatoid arthritis (RA), and so on.
Almost every cell in the human body uses copper, as most contain
copper-dependent enzymes.
Unfortunately, excessive amounts of copper are toxic for the human body, whereas low amounts of copper also lead to health problems, manifested in
Menkes disease.
Typically, 50% of the daily copper intake is absorbed in the GI tract and transported to the liver from where it is transported to the peripheral tissue bound to
ceruloplasmin(copper-binding glycoprotein)
Copper is an essential trace metal, and copper ions are incorporated into a number of metalloenzymes–so called
cuproenzymes.
In the human body, the majority of copper ions can be found as Cu2+; nevertheless, the oxidation state shifts between the
cuprous (Cu+) and cupric (Cu2+) forms.
a genetic disorder in which excessive amounts of copper build up in the human body.
Wilson disease
The copper is mainly stored in the ____and _____, and therefore causes liver cirrhosis and damage to the brain tissue.
liver and brain
a typical brown ring is visible around the iris; therefore Wilson disease is also called
hepatolenticular degeneration
salber
what is the English word ‘_____”.
silver
Silver is widely distributed in nature. It can be found in its native form and in various ores such as _______, which is the most important ore mineral for silver, and _____.
argenite (Ag2S) & horn silver (AgCl)
Silver has no known active biological role in the human body, and the levels of Ag+ within the body are below detection limits. The metal has been used for thousands of years mainly as
ornamental metal or for coins.
