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 ?
It is shown that method of electron beam evaporation in vacuum of stainless steel and salts of the alkaline metal halogenides with different melting temperatures (chloral sodium and chloral potassium) allows producing in joint deposition of their vapor flows porous condensates, temperature dependence of porosity of which is of nonmonotonous character with maximum in the area of 0.
Via-Tek's patent pending hydrogen gas generator produces hydrogen gas from water via the time release of measured amounts of an alkaline metal emulsion into a water reservoir.
DNS-100's breakthrough technology removes sodium and alkaline metals from fuel oil, ensuring that gas turbine engines run more efficiently and achieve longevity up-to and beyond their normal service intervals.

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