Strontium chloride hexahydrate (H 12Cl 2O 6Sr) is an ingredient in toothpaste for sensitive teeth. Modern ‘glow-in-the-dark ’ paints and plastics contain strontium aluminate (SrAl 2O 4), where they absorb light during the day and release it slowly for hours afterwards. It high-energy radiation can be used to generate electricity for space vehicles, remote weather stations and navigation buoys. Strontium-90 is a dangerously radioactive isotope, It is a by-product of nuclear reactors and present in nuclear fallout (from whose spent fuel is extracted). It is one of the best high-energy beta-emitters. It also has found use in producing ferrite magnets and in refining zinc. Strontium compounds are used in pyrotechnics and gives the brilliant red colour to fireworks and flares. SStrontim has similar uses of calcium and a brium but it is employed rarely because of its higher cost. Naming: After the mineral strontianite, itself named after Strontian, Scotlandįirst isolation:Humphry Davy (1808) Strontium Uses The metal can also be prepared by electrolysis of a solution of strontium chloride in molten potassium chloride: The sulfate is reduced to the sulfide by the carbothermic reduction: The metal dissolves readily in dilute or concentrated hydrochloric acid (HCl) and forming Sr (II) ions and hydrogen gas. Sr (s) + I 2 (g) → SrI 2 (s) (Strontium (ll) iodide) Sr (s) + Br 2 (g) → SrBr 2 (s) (Strontium (ll) bromide) Sr (s) + Cl 2 (g) → SrCl 2 (s) (Strontium (ll) chloride) Strontium react with Chlorine, bromine, iodine and forming Strontium (II) halides: Strontium reacts slowly with water and forming strontium hydroxide (Sr(OH) 2)and hydrogen gas (H 2). When Ignited, Strontium metal burns in air and reacts with both oxygen and nitrogen, to give a mixture of white strontium oxide (SrO) and strontium nitride (Sr 3N 2) Strontium reacts with oxygen (O 2)and forming a protective layer of SrO on the surface. Isotopes: 82 Sr 83 Sr 84 Sr 85 Sr 86 Sr 87 Sr 88 Sr 89 Sr 90 Sr Isotope Lattice constant: 608.49, 608.49, 608.49 pmįace Centered Cubic (FCC) Reactivity of StrontiumĮlectron affinity: 5.03 kJ/mol Nuclear Properties of Strontium The ionization potential of an atom: 5.67 Poisson ratio: 0.28 Atomic Properties of Strontium Molar magnetic susceptibility: 0.116×10 -9 m 3/mol Physical Properties of Strontiumĭensity: 2.64 g/cm 3 (In solid) 2.375 g/cm 3 (In Liquid) Mass magnetic susceptibility: 1.32×10 -9 m 3/kg Volume magnetic susceptibility: 0.00000347 Magnetic susceptibility (x mol): -92×10 -6 cm 3/mol Thermal conductivity: 35.4 W/(m∙K) Electrical properties of StrontiumĪ Electrical type: Conductor Magnetic Properties of Strontium This fact has key implications for the building up of the periodic table of elements.Strontium Electron Configuration Thermal Properties of Strontiumĭebye temperature: 147 K (-126.15 oC, -195.07 oF) The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atom’s electrons has been assigned a unique set of quantum numbers. It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. In the periodic table, the elements are listed in order of increasing atomic number Z. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. The configuration of these electrons follows from the principles of quantum mechanics. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. See also: Atomic Number – Does it conserve in a nuclear reaction? Atomic Number and Chemical PropertiesĮvery solid, liquid, gas, and plasma is composed of neutral or ionized atoms. It is the electrons that are responsible for the chemical bavavior of atoms, and which identify the various chemical elements. In a neutral atom there are as many electrons as protons moving about nucleus. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10 -19 coulombs. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The nucleus is composed of protons and neutrons. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons.
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