tantalum

Name tantalum
Symbol Ta
Atomic Weight 180.9479
Atomic Number 73
CAS ID 7440-25-7
Group Number 5
Group Name (none)
Period Number 6
Origin of Name Greek, Tantalos = father of Niobe.
Year Discovered 1802
Discovery Credits Discovered by A. G. Eceberg at Uppsala, Sweden.
Class Metallic
Color Gray Blue
Standard State Solid at 77 F & 298 K
Description Shiny, silvery metal, soft when pure. Very corrosion resistant due to oxide film; attacked by HF and fused alkalis. Used in electronics as tantalum capacitors, cutting tools, chemical plants and surgery.

Diagnostic tests: 
There are no simple tests to detect tantalum.  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