代写范文

留学资讯

写作技巧

论文代写专题

服务承诺

资金托管
原创保证
实力保障
24小时客服
使命必达

51Due提供Essay,Paper,Report,Assignment等学科作业的代写与辅导,同时涵盖Personal Statement,转学申请等留学文书代写。

51Due将让你达成学业目标
51Due将让你达成学业目标
51Due将让你达成学业目标
51Due将让你达成学业目标

私人订制你的未来职场 世界名企,高端行业岗位等 在新的起点上实现更高水平的发展

积累工作经验
多元化文化交流
专业实操技能
建立人际资源圈

Nickel

2013-11-13 来源: 类别: 更多范文

Nickel Nickel is a magnetic metallic element that is mainly used in making alloys. It is one of the transition elements of the periodic table. The atomic number of nickel is 28, the symbol is Ni, the atomic weight is 58.6934, it becomes a solid at 298 K, and it color is a lustrous, metallic, silvery tinge. Nickel was used in coins in nickel-copper alloys for several thousand year, but it was not recognized as an element until 1751, when Baron Axel Frederic Cronstedt, a Swedish chemist, isolated the metal from “niccolite” ore. Nickel is a hard, malleable, and ductile metal. It has magnetism below 345° C (653° F). Metallic nickel is not very active in chemical reactions. It melts at about 1,455° C (2,651° F) and boils at about 2,730° C (4,946° F). Nickel is found as a metal in meteors. It is also found in minerals such as “garnierite”, “millerite”, “niccolite”, “pentlandite”, and “pyrrhotite”. Nickel is the 22nd most abundant in element found in rocks in the earth’s crust. Nickel is used as a protective and ornamental coating for metals that are susceptible to corrosion. It is used mostly to form alloys. It adds strength nickel, metal, about, found, alloys, world, states, one, metallic, element, corrosion, compounds, coins, year, united, sulfate, silvery, resistance, percent, often, niso4, nickel-cadmium, niccolite, minerals, meteorites, malleable, iron, hard, form, ductile, discovery, cronstedt, copper, contains, color
上一篇:Endoplasmic_Reticulum 下一篇:Bridge_Forces