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...lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). They are all shiny, soft, highly reactive metals at standard temperat * '''[[Francium]] (Fr)''': The second-least electronegative element, behind only caesium, a

...metal group, which also includes lithium, sodium, potassium, rubidium, and francium.

...ed. These elements, now known as gallium, scandium, germanium, technetium, francium, astatine, rhenium, and protactinium, were all discovered after Mendeleev's

...metal group, which also includes lithium, sodium, potassium, rubidium, and francium.

...metal group, which also includes sodium, potassium, rubidium, cesium, and francium.