niobium

Name niobium
Symbol Nb
Atomic Weight 92.90638
Atomic Number 41
CAS ID 7440-03-1
Group Number 5
Group Name (none)
Period Number 5
Origin of Name Greek, Niobe = "daughter of Tantalus"
Year Discovered 1801
Discovery Credits Discovered by C. Hatchett at London, UK
Class Metallic
Color Gray Metallic
Standard State Solid at 77 F & 298 K
Description Shiny silvery metal, soft when pure. Resists corrosion due to oxide film, attacked by hot, concentrated acids but resists fused alkalis. Used in stainless steels and super-conductor alloys. The element was formerly known as "columbium".

Diagnostic tests: 
An acid solution boiled with metallic tin gives a blue color which slowly changes to brown on continued boiling and disappears on dilution. Most flux reactions are not very good. Absorption Spectroscopy is used for quantitative analysis and Energy Dispersive Analysis of X-rays (EDAX) is used for qualitative analysis.

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