An element with a single electron in its highest energy level is probably an
alkali metal.
Alkali metals are found in group 1 of the periodic table. They have
characteristic shiny and soft and are highly reactive due to the presence of
just one valence electrons in their outermost shell.
Example of alkali metals include potassium, sodium, caesium etc. They have
a single electron in its highest energy level which validates it being an alkali
metal.
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