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Gallium is a chemical element; it has the symbol Ga and atomic number 31. Discovered by the French chemist Paul-Émile Lecoq de Boisbaudran in 1875, [13] ...
Pure boron is a shiny, silver-grey crystalline solid. [241] It is less dense than aluminium (2.34 vs. 2.70 g/cm 3 ), and is hard and brittle. It is barely reactive under normal conditions, except for attack by fluorine , [ 242 ] and has a melting point of 2076 °C (cf. steel ~1370 °C). [ 243 ]
The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.
Zinc is bluish-white and lustrous, [9] though most common commercial grades of the metal have a dull finish. [10] Zinc is also referred to in nonscientific contexts as spelter. [11] Cadmium is soft, malleable, ductile, and with a bluish-white color. Mercury is a liquid, heavy, silvery-white metal.
Gallium crystals. Most metals are shiny and lustrous, at least when polished, or fractured.Sheets of metal thicker than a few micrometres appear opaque, but gold leaf transmits green light.
"The (Defense) Department is proactively taking steps using Defense Production Act Title III authorities to increase domestic mining and processing of critical materials for the microelectronics ...
China on Tuesday banned exports to the United States of the critical minerals gallium, germanium and antimony that have widespread military applications, escalating trade tensions the day after ...
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