Introducing Strontium
Imagine an element that adds a vibrant crimson glow to fireworks, making festivals like Diwali even more spectacular. That element is Strontium, a fascinating member of the periodic table. It is a chemical element with the symbol Sr and atomic number 38. Belonging to the alkaline earth metals group, Strontium is a soft, silvery-white metal that is highly reactive. When exposed to air, it quickly reacts to form a yellowish oxide layer.
The Discovery and Naming of Strontium
The story of Strontium begins in the late 18th century. In 1790, Adair Crawford, a Scottish physician and chemist, along with his colleague William Cruickshank, recognized a new mineral from a lead mine in the village of Strontian in Argyllshire, Scotland. They determined that this mineral contained a new “earth” (oxide) distinct from known barium minerals. This new earth was subsequently named strontia.
It was Humphry Davy, a renowned English chemist, who successfully isolated the pure metallic element in 1808 through the electrolysis of molten strontium chloride. He then named the element Strontium, directly referencing the village of Strontian where its unique mineral was first discovered. The name “Strontium” literally means “from Strontian.”
Quick Facts about Strontium
- Atomic Number: 38, placing it in Period 5, Group 2 of the periodic table.
- Appearance: A soft, silvery-white metal that tarnishes rapidly upon exposure to air.
- Flame Colour: Strontium compounds are well-known for producing a brilliant crimson red colour when heated in a flame, making them ideal for red pyrotechnics seen in fireworks during celebrations across India.
- Historical Use in CRTs: Historically, Strontium was used in the faceplate glass of Cathode Ray Tube (CRT) televisions and computer monitors to block X-ray emissions.
- Natural Occurrence: Strontium is naturally found in minerals like celestine (strontium sulfate) and strontianite (strontium carbonate. While not extensively mined in India for Strontium itself, minerals containing Strontium are present in various geological formations across the country.