Innovative
发表于 2025-3-26 22:50:35
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变异
发表于 2025-3-27 04:31:15
, Cs (cesium),Caesium salts used in the manufacture of electronic high vacuum valves result in the reduction of caesium from the chloride salt by molten barium metal. This is a by-product of the high vacuum process required by modern electronic equipment and is not a real source of the metal.
常到
发表于 2025-3-27 09:20:07
, Ca,Calcium resembles aluminium and magnesium in many of its properties but is more difficult to cast as it oxidizes much more rapidly. It is also much softer and more ductile, being readily cut with a knife and bent by hand. Although it burns readily in air it is not subject to spontaneous combustion and can be safely handled.
outer-ear
发表于 2025-3-27 10:37:50
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关心
发表于 2025-3-27 14:50:54
, Cu,Copper and its alloys have been in the service of mankind for longer than any other metal, and until the second half of this century it had the largest use of any metal after iron. Aluminium has now taken second place and copper is third in the table for usefulness.
Integrate
发表于 2025-3-27 21:11:04
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挑剔为人
发表于 2025-3-28 01:59:21
, Ge,Germanium is a metalloid, having some non-metallic characteristics, but not as marked as in silicon, or boron. It is a very brittle material, quite stable in air up to red heat.
恫吓
发表于 2025-3-28 02:33:34
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巡回
发表于 2025-3-28 07:49:36
, Ha,Hafnium is a metal very similar to zirconium and is invariably found with zirconium. It is found in the USA, principally in Florida, and in Australia and Brazil. Some is found also in Africa and India.
原谅
发表于 2025-3-28 12:00:19
, In,The compounds of indium occur in small quantities widely scattered throughout the world. To date no deposits large enough to warrant extraction of the metal are known, but certain tin, lead and zinc ores contain appreciable quantities.