Classification and Elemental Character
Metallic Nature
Barium is categorized as an alkaline earth metal, occupying Group 2 within the periodic table. Its position confirms its inherent metallic characteristics. It is not a non-metal or a metalloid.
Observable Physical Attributes
Appearance and Texture
When freshly exposed, barium displays a distinct silvery-white, lustrous appearance. This brightness is ephemeral; upon contact with air, barium rapidly oxidizes, resulting in the formation of a dull grey surface layer. Due to this high reactivity, elemental barium is typically stored under inert atmospheres or mineral oil in laboratories worldwide to prevent tarnishing and preserve its metallic integrity. In terms of texture, barium is a relatively soft metal, demonstrating greater malleability than many transition metals.
State at Room Temperature
At standard room temperature (typically 20-25 °C), barium exists in a solid physical state.
Thermal Phase Transitions
Melting and Boiling Points
Barium transitions from a solid to a liquid state at a temperature of 727 °C. Subsequently, the boiling point, where liquid barium converts into a gaseous state, is 1897 °C.