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 ?
Radke, "Evidence from alkali metal NMR spectroscopy for ion pairing in alkaline silicate solution," Journal of Physical Chemistry, vol.
In the maximum elevation, [H.sub.max]/(2[L.sub.c] [absolute value of cot([theta])]), presented in Figure 4(a), the values of each molten alkali metal salt are consistent when the ratio of the container radius to the capillary length is larger than 5.
Our aim was to determine the surface emission of alkali metal ions ([Li.sup.+], [Na.sup.+], [K.sup.+], [Rb.sup.+], and [Cs.sup.+]) as compared with the natural form of MM.
Li and Tan et al., and so forth, prepared a series of catalysts by using oxides which were impregnated with alkali metal and alkaline earth metal, and they sorted the catalytic activity by doing experiments: [Cs.sub.2]O/[gamma]-[Al.sub.2][O.sub.3] > [K.sub.2]O/[gamma]-[Al.sub.2][O.sub.3], BaO/[gamma]- [Al.sub.2][O.sub.3] > [Na.sub.2]O/[gamma]-[Al.sub.2][O.sub.3], and CaO/[gamma]-[Al.sub.2][O.sub.3] > MgO/[gamma]-[Al.sub.2][O.sub.3].
"I've been working with alkali metals for 50 years.
The anode may be an alkali metal such as a lithium compound or alloy.
The 60page book also includes a completely updated review of Spectroflux alkali metal borate fusion fluxes.
Low odor compared to alkali metal soap surfactants.