Estroncio is the Spanish word for 'strontium,' a chemical element with the symbol Sr and atomic number 38. It is an alkaline earth metal that is soft and has a silvery appearance when freshly cut, but it quickly oxidizes to a yellowish color when exposed to air. noun
Strontium is used in the production of fireworks to create a bright red color.
The element strontium is found naturally in minerals such as celestite and strontianite.
Strontium compounds are often used in the glass for color television cathode ray tubes.