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Vor 5 Tagen · The history of chemistry represents a time span from ancient history to the present. By 1000 BC, civilizations used technologies that would eventually form the basis of the various branches of chemistry. Examples include the discovery of fire, extracting
Vor 4 Tagen · 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [1]
Vor 5 Tagen · Cobalt ist Bestandteil von magnetischen Legierungen, als Trockner ( Sikkativ) für Farben und Lacke, als Katalysator zur Entschwefelung und Hydrierung, als Hydroxid oder Lithium-Cobalt-Dioxid (LiCoO 2) in Batterien, in korrosions - bzw. verschleißfesten Legierungen und als Spurenelement für Medizin und Landwirtschaft.
Vor 15 Stunden · Kupfer ist ein natürlich vorkommendes Element, das man in verschiedenen Formen und Konzentrationen in der Erdkruste, den Ozeanen, Seen und Flüssen finden kann. Flora und Fauna haben sich im Rahmen dieses natürlichen Vorhandenseins von Kupfer entwickelt.
Vor einem Tag · Modern science is typically divided into three major branches: the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences (e.g., logic, mathematics, and theoretical ...
Vor einem Tag · Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms. For example, any atom that contains 11 protons is sodium ...
Vor 3 Tagen · Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature.
