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The alkali metals are a group in the periodic table consisting of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). This group lies in the s-block of the periodic table as all alkali metals have their outermost electron in an s-orbital,bonding well with halogens a common example of that is table salt (sodium chloride). The alkali metals provide the best example of group trends in properties in the periodic table, with elements exhibiting well-characterized homologous behavior. These metals are soft, shiny and highly reactive even at STP (Standard Temperature and Pressure) conditions. The discovered ones can be found in nature, with sodium being the most abundant, followed by potassium, lithium, rubidium, cesium and francium; the last one however is pretty rare, since it's radioactive and really unstable. They all share the same oxidation number, +1 and have the lowest electronegativity of all the elements of the periodic table.