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Vor 3 Tagen · Gold (mittelhochdeutsch golt; bereits althochdeutsch gold, zu einer indogermanischen Wurzel *g h el-‚gelb‘) ist ein chemisches Element mit dem Elementsymbol Au (lateinisch aurum) und der Ordnungszahl 79. Gold ist ein gelbglänzendes Metall und steht im Periodensystem in der 1. Nebengruppe (Gruppe 11), zusammen mit Kupfer und Silber, der ...
Vor 3 Tagen · Gold is a chemical element with the symbol Au (from the Latin word aurum) and the atomic number 79. In its pure form, it is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals.
Vor 4 Tagen · Sodium is a chemical element; it has symbol Na (from Neo-Latin natrium) and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is 23 Na.
Vor 3 Tagen · Gold, a dense lustrous yellow precious metal and a chemical element of Group 11. Gold is attractive in color and brightness, durable to the point of virtual indestructibility, highly malleable, and usually found in nature in a comparatively pure form.
Vor 5 Tagen · copper (Cu), chemical element, a reddish, extremely ductile metal of Group 11 (Ib) of the periodic table that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature. This native copper was first used (c. 8000 bce) as a substitute for stone by Neolithic (New Stone Age) humans.
Vor 2 Tagen · In mathematics, a group is a set with an operation that satisfies the following constraints: the operation is associative and has an identity element, and every element of the set has an inverse element. Many mathematical structures are groups endowed with other properties.
Vor 15 Stunden · There are 230 space groups in three dimensions, given by a number index, and a full name in Hermann–Mauguin notation, and a short name (international short symbol). The long names are given with spaces for readability. The groups each have a point group of the unit cell.
