![]() ![]() He and his fellow colleague William Cruickshank held the belief that the new mineral was, in fact, a completely different and new substance. Crawford had a reserved opinion on what was labeled as barium carbonate. They had labeled the mineral ‘ strontites ’, while its oxides were known as ‘ strontia ’. During his scientific work, his attention was caught by a mineral sample obtained from a lead mine near the small town of Strontian in Argyll, Scotland.Īt that time, his fellow colleagues were considering beryllium and strontium as the same element. When the Irish chemist and physician Adair Crawford (1748 – 1795) first attempted to determine the specific heats of the gaseous elements, he conducted a series of experiments. Due to this reason, strontium must be isolated and kept away from both air and water when stored. It’s softer than calcium and harder than barium.īeing an alkaline earth metal, strontium tarnishes rapidly upon exposure to air and produces volatile reactions when it comes into contact with H2O. Strontium metal occurs in three crystalline allotropic forms with transition points at 235☌ and 540☌. When dissolved in liquid ammonia, it forms a dark blue solution. This silvery metal has a high refractive index and burns with a distinctive red color flame. This member of the alkaline earth metals family of elements in the periodic table has an electronegativity of 1.0 according to Pauling, whereas the atomic radius according to van der Waals is 0.215 nm. It reaches its boiling point at 1377☌, 2511☏, 1650 K, while the melting point is achieved at 777☌, 1431☏, 1050 K. With the periodic table symbol Sr, atomic number 38, atomic mass of 87.62 g.mol -1, and electron configuration 5s 2, strontium is a soft, yellow alkaline-earth metal with a silvery luster. In 1790 by Adair Crawford and William Cruickshank The symbol in the periodic table of elementsįrom less than 25 milliseconds to 28.9 years Chemical and Physical Properties of Strontium Property
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