Classification of Strontium
Strontium is categorized as an alkaline earth metal, occupying Group 2 of the periodic table. This classification indicates that it exhibits characteristic metallic properties.
Metallic Characteristics
As a metal, Strontium displays properties such as good electrical conductivity and thermal conductivity. It is also lustrous when freshly exposed.
Observable Physical Attributes
Coloration
When pure and freshly cut, Strontium appears as a silvery-white metal with a bright, metallic luster. However, due to its high reactivity with oxygen and moisture in the air, its surface rapidly tarnishes, acquiring a yellowish or brownish film. This tarnishing is a surface oxidation process observable globally where the element is exposed to atmosphere. Another notable physical property related to its color is its characteristic crimson-red emission when heated in a flame, a property widely utilized in pyrotechnics worldwide to produce red fireworks.
Texture and Malleability
Strontium is a relatively soft metal. It is sufficiently soft to be cut with a knife. It is also malleable, meaning it can be hammered into thin sheets, and ductile, allowing it to be drawn into wires. This softness is a typical characteristic of alkaline earth metals, though Strontium is harder than Calcium but softer than Magnesium.
State at Room Temperature
At standard room temperature (approximately 20-25 °C), Strontium exists as a solid.
Thermal Properties
Melting and Boiling Points
Strontium has a distinct melting point and boiling point. Its melting point is approximately 777 degrees Celsius (°C). This relatively high temperature means it remains solid under most typical terrestrial conditions. The boiling point of Strontium is approximately 1377 degrees Celsius (°C). These values are indicative of the energy required to overcome the metallic bonds holding the atoms together in its solid and liquid states, respectively.