They are not called alloys, these 5 metals are elements. An alloy is a metal which consists chemically of 2 or more different metals.
Gold, silver, copper, zinc, and nickel are often alloyed with other metals to improve upon the physical characteristics of the pure metal. Pure gold, for example, is soft and will be damaged quickly when used as coinage. It is much more durable when it is alloyed with silver. All metals used in manufacturing coins are alloys, but are referred to by the name of the main element in the alloy.
on there own they're too soft for many uses so they are mixed together to make them harderthey are alloys because they are metals made up of mixtures of other substances, not pure elements like iron. Steel is made up of mainly iron and carbon; bronze is made up of mainly copper, and usually a bit of tin but often other elements like phosphorus.
The British One Pound coin is made from 70% copper, 24.5% zinc and 5.5% nickel.
As far as coins go, the One Pound coin is a relatively high value general circulation coin and the alloy of these metals in these percentages make a gold coloured hard wearing, durable coin that is resistant to corrosion and is cheap to make.
To get the properties we want for specific applications.
These metals (especially platinum and gold) are less chemically reactive.
These metals (especially platinum and gold) are less chemically reactive.
no
Gold is a very unreactive metal and is found in its native state in the ground, platinum and silver also behave this way. Other metals that are not of this nature are found mixed in with rocks and these are called ores.
Platinum is a very rare metal; platinum exist in the nature as a free element, alloyed with other noble metals, as sulfides, arsenides, tellurides etc.
It is a scale of how reactive metals are here it is potassium most reactive sodium calcium magnesium aluminium zinc iron tin lead silver gold platinum least reactive
These metals (especially platinum and gold) are less chemically reactive.
Noble metals are called platinic metals (platinum, palladium, rhodium, osmium, iridium, ruthenium) and also gold and silver.
no
8 noble metals are: gold silver palladium iridium platinum rhodium ruthenium osmium some add: rhenium
Because they don't react with other elements.
Noble metals: platinum, iridium, rhodium, palladium, osmium, ruthenium, silver, goldNoble gases: helium, neon, argon, krypton, xenon, radonNoble in this case has the significance of with low chemical reactivity.
The noble metals such as gold, silver, or platinum (etc.) do not readily corrode in salt water
They generally do not react with other elements. In other words, they're "too good" to associate with anything else. When discussing metals, it also means that they don't corrode (i.e. they don't oxidize). Noble metals such as gold and platinum are considered more valuable than metals such as silver, which slowly tarnishes.
My first car was a Noble. Gold and silver are noble metals.
The noble metals are a group of metals that resist oxidation and corrosion in moist air. They are the opposite of the base metals, which more readily oxidize and corrode. Some of the noble metals are gold, platinum, and iridium. Aside from being corrosion resistant, they are also very expensive.
Examples: alkali metals, alkali earth metals, noble gases, platinum metals, halogens, etc.
Gold is a very unreactive metal and is found in its native state in the ground, platinum and silver also behave this way. Other metals that are not of this nature are found mixed in with rocks and these are called ores.