Gold is a soft, heavy, yellow metal. It is a chemical element. Its chemical symbol is Au. Its atomic number is 79. It has been used for many thousands of years by people all over the world, for jewelry, decoration, and as money. Gold is important because it is rare, but also easier to use than other rare metals. It is also used to repair and replace teeth and in electronic equipment such as computers. The color of this metal is also called gold.
Often, gold is found as a native element. This means it is not part of an ore, and does not need extracting.
Properties[change | change source]
In chemistry, gold is chemical element 79, a transition metal in Group 11. It has an atomic weight of 199.96 a.m.u. Its symbol is Au, from the Latin word for gold, aurum. It is a "noble metal" meaning it has low chemical reactivity.
Gold is very soft. It is malleable, meaning a goldsmith can hammer it into thin metal sheets. It is also ductile, which means it can be pulled into wire. When it is used in money or in jewelry, it is often alloyed with silver or some other metal to make it harder.
Language and culture[change | change source]
Gold can mean that something or someone is very good or has done very well. A gold medal is often the given to the first place winner in a race or other sports. Something that is in some way good may be given gold status.
References[change | change source]
- "Relativity in Chemistry". Math.ucr.edu. http://math.ucr.edu/home/baez/physics/Relativity/SR/gold_color.html. Retrieved 2009-04-05.
- Schmidbaur, Hubert; Cronje, Stephanie; Djordjevic, Bratislav; Schuster, Oliver (2005). "Understanding gold chemistry through relativity". Chemical Physics 311 (1–2): 151–161. doi:10.1016/j.chemphys.2004.09.023.
Other websites[change | change source]
|Wikimedia Commons has media related to: Gold|
|The Simple English Wiktionary has a definition for: gold.|