Strontium Element in Periodic Table | Atomic Number Atomic Mass
Strontium is a chemical element with atomic number 38 and is present in the Group II of the periodic table. The elements in the Group II are called alkaline earth metals and they have two electrons in their outermost s-orbital. Due to the presence of two electrons in the outermost orbit, the valency of alkaline earth metals is two. It is a very reactive in its purest form and it is always found in the combined state with other elements. Finely powdered strontium catches fire when exposed to air at room temperature and reacts vigorously with water to form hydroxides, liberating hydrogen with heat. Hence, pure strontium metal is preserved in liquid hydrocarbons or mineral oils like kerosene at low temperature to prevent ignition. Similar to calcium and barium, strontium too dissolves directly in liquid ammonia resulting in a dark blue solution.
Strontium Element Uses:
The major use of strontium is its utility in preparation of glass for colour television cathode ray tubes, where it prevents emission of X-rays. However, new types of TV screens have replaced cathode ray tubes. Strontium, being similar to calcium, is sometimes substituted for calcium for incorporating into human bones under extremely careful medical observation, since infinitesimally higher/wrong doses too can be carcinogenic. The isotopes 87Sr and 86Sr are used to find out the origin or source of sediment in natural systems, especially fluvial and marine environment and they are also used to find out the place of origin of ancient archaeological minerals. Strontium carbonate and other salts are used in fireworks to impart attractive purple colour while burning. Strontium chloride is used in toothpastes meant for sensitive teeth.
Strontium Element Information:
Discovery year: 1787
Discovered by:William Cruickshank
Atomic number: 38
Relative atomic mass: 87.62
Electron configuration: [Kr] 5s2
Other elements in the same block:
Period: period 5
Other elements in the same period:
Group: group 2 (alkaline earth metals)
Other elements in the same group:
Other elements in the same orbital:
Rubidium is the element in the same orbital.
Key isotopes: 86Sr, 87Sr, 88Sr
Melting point: 777°C, 1431°F, 1050 K
Boiling point: 1377°C, 2511°F, 1650 K
Element category: alkaline earth metal
Density (g cm−3): 2.64
CAS number: 7440-24-6
Color: silvery white metallic
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