BASIC INFORMATION ABOUT GOLD
Almost everyone loves gold, but a lot of people do not know much about this shiny element. Here are a few interesting facts about the element, gold. Gold happens to be the element that is yellow in colour. Though other elements may also look yellowish – due to oxidation or chemical reactions.
Almost all gold existing on our planet reached the Earth over 200 million years ago when meteorites packed with gold and other metals bombarded its surface.
The element symbol for gold is AU. The name for the symbol comes from the Latin word aurum. Aurum translates to «glow of sunshine».
Interesting Facts About Gold
Another interesting fact about gold is how ductile it is. One ounce of this precious metal can be flattened and stretched into a thread 5 miles long.
When it comes to malleability, or how easy it is to hammer metal into thin sheets, gold is number one. One ounce of gold can be beaten down to a 300 square feet sheet. It can even become transparent. Some reason why the thin sheets of gold appear to be a greenish blue in colour is that the element reflects red and yellow, strongly.
Gold is also non-toxic. Some restaurants add gold metal flakes to their fancier dishes or drinks.
24-karat gold is pure gold. 18-karat is only 75%, 14k is 58.5%, and 10k is 41.7% gold. Though typically, the remainder is silver, it can be either platinum, palladium, zinc, or even copper.
Gold does not easily corrode. Air, water, and acidic conditions leave gold unreactive. Though acids do dissolve metals, for gold to dissolve, one will have to use aqua regia.
Gold is good for other things such as electronics, electrical wiring, and dentistry. It is also used in medicine, colouring glass, and shielding radiation. Metallic gold that is high in purity tends to be tasteless and odourless. It makes sense especially with the metal being unreactive. Metallic compounds and elements have flavour or odour due to metal ions.
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• Au concentrates