The element has a metallic, bright silver luster. It is relatively stable in air at room temperature, and is readily attacked and dissolved by dilute and concentrated mineral acids, to evolve hydrogen. The metal is soft enough to be cut with a knife and can be machined without sparking if overheating is avoided.
Melting point: 1413 °C Boiling point: 2567 °C
A powder is a solid material with a defined size range.