What type of metals, such as sodium, have a single valence electron and are very reactive?

Answer

The type of metals, such as sodium, that have a single valence electron and/or are very reactive are the alkali metals. These metals are located on the left side of the periodic table.
1 Additional Answer
Alkali metals such as sodium and potassium are considered to be the most reactive elements. Each of the atoms contain a single electron valence that are lost easily to form cations.
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The alkali metals easily yield the one electron found in their valence shell, to bond with other elements. Since it takes so little energy to remove this electron from an alkali metal
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