 |
| 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.
|
Back to Elements Table Page
| |
