All About Nickel: History, Invention, Some Significant Applications, Characteristics And Significance For many thousands of years, men have used nickel in a lot of their needs. Back then, they weren't conscious of the chemical characteristics of the element and which they could use nickel alloys in many different applications also. What is nickel? Nickel is a versatile metal, a chemical element, with an atomic number of 28 and chemical symbol Ni. It is glossy and sometimes silvery-white in look. It is a ferromagnetic component which can exist in room temperature. There're only three other components which have the same characteristic: gadolinium, iron and cobalt. How was nickel discovered? It is thought that man has used nickel since 3500 BC. However, it was only in 1751 that it was categorized and recognized as a chemical element by Swedish chemist and mineralogist Axel Fredrik Cronstedt who, for the first time, thought it was a copper mineral. From then, essential nickel ore minerals are discovered, such as limonite, pentlandite and garnierite. What are the characteristics of nickel? The characteristics of nickel are divided into atomic, physical, isotopes, and chemical. Its atomic properties include its electronic configuration, electron structure, and any other electron-related stuff. Its physical properties include its color (that is silvery-white), magnetic abilities (like what was stated before, it is among the four elements which have magnetic abilities at room temperature, but is non-magnetic when open in temperature greater than that), & unit cell structure (nickel has a face centered cubic unit cell). It is also ductile and hard. Nickel has 5 stable isotopes, all of them has an unique set of properties and characteristics. And when we speak of nickel's chemical properties, it takes place in many oxidation states. The most common of them all is +2. Where is nickel used? 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