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This is because all the atoms of alkali metals have one valence electron. 1610 assess and manage risks associated with the storage and use of alkali metals and recall that alkali metals are easily cut are shiny when freshly cut and tarnish rapidly in air. Difference Between Lithium And Other Alkali Metals Definition Chemical Facts Properties Differences The alkali metals are highly electropositive which means they readily lose. . Based on their electronic arrangement explain whether they exist alone in nature. Based on their electronic arrangement explain whether they exist alone in nature. 169 demonstrate knowledge and understanding that the alkali metals have low density and the first three are less dense than water. All the alkali and alkaline earth metals are silvery white in appearance. Alkali metals have one electron in their outer shell which is loosely bound. Summary of Common Alkaline Earth Properties Two electron...