1) Potassium, sodium or lithium 2) Sodium or potassium
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https://www.crosswordclues.com/clue/alkali-metal
(alkaline earth metal) alkali metal element. The Group 1 elements, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr) react with cold water for form strongly alkaline hydroxide solutions, and are referred to as 'alkali metals'. Hydrogen is not considered an alkali metal, despite its position on some periodic ta...
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http://antoine.frostburg.edu/chem/senese/101/glossary/a.shtml
The alkali metals are a group in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs),{#tag:ref|Caesium is the spelling recommended by the International Union of Pure and Applied Chemistry (IUPAC). The American Chemical Society (ACS) has used the spelling cesium since 1921, fo...
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http://en.wikipedia.org/wiki/Alkali_metal
any of the six chemical elements that make up Group 1 (also called Group Ia) of the periodic table—namely, lithium (Li), sodium (Na), potassium (K), ... [10 related articles]
Found on
http://www.britannica.com/eb/a-z/a/47
A metal in the first column of the periodic table (i.e., lithium, sodium, potassium, rubidium, cesium and francium). With the exception of francium, these metals are all soft and silvery. They may be readily fused and volatilized with their melting and boiling points becoming lower with increasing atomic mass. They are the strongest electropositive...
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http://www.chemistry-dictionary.com/definition/alkali+metal.php
Any of the six elements: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The alkali metals make up group 1 of the periodic table of elements. They all form singly charged positive ions, are highly electropositive, and are extremely reactive. The reactivity ...
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http://www.daviddarling.info/encyclopedia/A/alkali_metal.html
A metal in group lA of the periodic system  namely, lithium, sodium, potassium, rubidium, cesium, and francium. They form strongly alkaline hydroxides, hence the name.
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http://www.encyclo.co.uk/local/20742
<chemistry> Any of the highly reactive metals (such as sodium or potassium) found in the first column of the periodic table, these metals act as bases. ... (13 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
one of a group of monovalent elements including lithium, sodium, potassium, rubidium, and cesium.
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http://www.encyclo.co.uk/local/21001
A metal in group lA of the periodic system – namely, lithium, sodium, potassium, rubidium, cesium, and francium. They form strongly alkaline hydroxides, hence the name
Found on
http://www.encyclo.co.uk/local/21115
A strongly basic metal like potassium or sodium.
Found on
http://www.encyclo.co.uk/local/22392
Type: Term Definitions: 1. an alkali of the family Li, Na, K, Rb, Cs, and Fr, all of which have highly ionized hydroxides. Synonyms: alkali3
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http://www.medilexicon.com/medicaldictionary.php?t=54589
A strongly basic metal like potassium or sodium.
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http://www.scientificpsychic.com/etc/geology-glossary.html
[
n] - any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium)
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http://www.webdictionary.co.uk/definition.php?query=alkali%20metal
A metal in group IA of the periodic table that form strongly alkalinehydroxides (lithium, sodium,potassium, rubidium,caesium, francium).HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcLanthanidesCePrNdPmSmEuGdTbDyHoErTmYbLuActinidesThPaUNpPuAmCmBkCfEsFmMdNoLr S...
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https://www.encyclo.co.uk/local/20687
alkaline metal noun any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium); `the hydroxides of the alkali metals are strongly alkaline`
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https://www.encyclo.co.uk/local/20974
Any of a group of six metallic elements with similar chemical properties: lithium, sodium, potassium, rubidium, caesium, and francium. They form a linked group (Group 1) in the periodic table of the elements. They each have a valency of one and have very low densities (lithium, sodium, and potassium float on water); in general they are reac...
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https://www.encyclo.co.uk/local/21221
any of the group of univalent metals including potassium, sodium, lithium, rubidium, cesium, and francium, whose hydroxides are alkalis.
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https://www.infoplease.com/dictionary/alkali-metal
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