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===Nickel=== [[File:Nickel chunk.jpg|frameless|left|upright=0.2]] [[Nickel]] (Ni) is an element in [[group 10 element|group 10]]. Nickel is rare in the Earth's crust, mainly due to the fact that it reacts with oxygen in the air, with most of the nickel on Earth coming from [[nickel iron meteorite]]s. However, nickel is very abundant in the [[Earth's core]]; along with iron it is one of the two main components. Nickel is an important component of stainless steel, and in many [[superalloys]].
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