[Definition]
The name niobium is officially approved by chemical authorities, but columbium is still used chiefly by metallurgists. Metallic element, atomic number 41, group VB of the periodic table, aw 92.9064, valences of 2, 3, 4, 5; no stable isotopes |
[Appearance]
shiny grey metallic solid |
[Melting point ]
2468 °C (lit.) |
[Boiling point ]
4742 °C (lit.) |
[density ]
8.57 g/mL at 25 °C(lit.)
|
[storage temp. ]
-20°C |
[solubility ]
insoluble in acid solutions |
[form ]
wire
|
[color ]
Silver-gray |
[Specific Gravity]
8.57 |
[Stability:]
Stable. Incompatible with strong bases, strong oxidizing agents, halogens, oxygen. |
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