Nickel is a chemical element with symbol Ni and its number is 28. It is a silvery-white lustrous metal with a slight golden color. Nickel relates to the transition metals and is hard and ductile. Pure nickel, powdered to maximize the reactive surface area, shows a major chemical action, but larger pieces are slow to react with air under some conditions because an oxide layer forms on the surface and prevents further passivation. Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interior side of larger nickel iron meteorites that were not exposed to oxygen when outside the Earth's atmosphere.
There is Nickel in the fourth energy level, d block, 7th column, so this means that the electron configuration will end 3d8 with the d orbital being one level lower than the energy level it is on.
Electronic configuration of chlorine is as follows
Cl chlorine : [Ne] 3s2 3p5
The electronic configuration of the argon is determined below
[Ne] 3s2 3p6
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