Alkali Metal


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alkali metal

[′al·kə‚lī ‚med·əl]
(chemistry)
Any of the elements of group I in the periodic table: lithium, sodium, potassium, rubidium, cesium, and francium.

Alkali Metal

 

any one of several chemical elements of the major subgroup of Group I of Mendeleev’s periodic system of the elements: lithium, sodium, potassium, rubidium, cesium, and francium. The subgroup’s name is derived from the hydroxides of the alkali metals, called caustic alkalies. The atoms of alkali metals have one s electron in their outer shell and, with the exception of lithium, two 5 electrons and six p electrons in the next to the last shell. The alkali metals always exhibit an oxidation number of +1 in their compounds. They are very reactive chemically. They are oxidized rapidly by atmospheric oxygen and react vigorously with water to form alkalies, MeOH (where Me is a metal). Their reactivity increases from lithium to francium. (See alsoLITHIUM; SODIUM; POTASSIUM; RUBIDIUM; CESIUM; and FRANCIUM.)

References in periodicals archive ?
Encapsulating alkali metals into silica gel enables scientists who have traditionally shied away from these metals to now safely and routinely perform reductions," said Sigma-Aldrich director of business development for chemistry Chris Hewitt.
Proceeding from that, alkali metal compounds can be divided into the following three groups: [p.
This market research report examines Spain's foreign trade and its perspectives on the global market for silicates, commercial alkali metal silicates.
Key statement: A method for producing a conjugated diene polymer is provided that includes a step of polymerizing a conjugated diene-containing monomer in a hydrocarbon solvent in the presence of an alkali metal catalyst, thus giving a polymer having a catalyst-derived alkali metal at one terminus of a polymer chain comprising a conjugated diene-based monomer unit, and a step of reacting the polymer obtained in the step of polymerizing and a trialkoxysilane compound represented by the formula:
The assets provide improvements in primary and secondary batteries such as lithium ion high conducting, non-crystalline electrolyte systems, high-conductivity alkali-metal-ion containing electrolytes having viscous liquid or rubber (boron-containing electrolytes) solid alkali metal salts, non-aqueous electrolyte solvents for use in secondary electric current producing cells, and highly conductive polyanionic polymers suitable for use in solid polymeric electrolytes in lithium batteries.
Indiana) documents the many phenomena that do not fit the theory, and compiles reports of research by him and and his collaborators that has led to a unified synthesis of alkali metal peculiarities.
The highly reactive alkali metal combines easily with other elements to form compounds.
This is because within the parameters of zinc silicates the solvent-borne ethyl silicates have been found to be more tolerant than the water-borne alkali metal zinc silicates.
Rodgers & Amunugama [14-18] investigated the absolute binding energies of alkali metal cations (from Li up to Cs) to several substituted (methyl, fluoro, amino, hydroxyl, and methoxy) benzene ligands.
A equals at least one alkali metal alkyl sulfonate, B is at least one compound selected from polyol esters and fatty acid alkanol amides and C is at least one compound selected from dibasic acid esters and polyethylene glycol esters.