nickel

Name nickel
Symbol Ni
Atomic Weight 58.6934
Atomic Number 28
CAS ID 7440-02-0
Group Number 10
Group Name (none)
Period Number 4
Origin of Name German, kupfernickel = "devils copper."
Year Discovered 1751
Discovery Credits Discovered by A. F. Cronstedt at Stockholm, Sweden.
Class Metallic
Color Silvery White, Lustrous
Standard State Solid at 77 F & 298 K
Description Silvery-white metal, lustrous, malleable, and ductile. Resists corrosion, soluble in acids, except concentrated nitric, unaffected by alkalis. Used in alloys, coins, metal plating, batteries, and catalysts.

Diagnostic tests: 
With borax bead test, nickel oxide gives an oxidizing flame bead which is violet when hot and brown on cooling, the reducing flame bead is gray and turbid from the separation of metallic nickel.
A solution of nickel becomes pale blue (like copper) on the addition of NH4OH in excess. If an alcoholic solution of dimethylglyoxine is added to an ammoniacal solution, a scarlet precipitate is formed.

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