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Why are alkali metals good conductors of heat and electricity?
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alkali metal
Modern version of the periodic table of the elements (printable).
Alkali metals are excellent conductors of heat and electricity because of the behavior of their valence electrons in the metallic state. Each alkali metal atom possesses a single electron in its outermost shell, which is weakly bound to the atom.1
When these atoms form a metallic structure, these valence electrons become delocalized, meaning they are no longer tied to a single atom but are instead free to move throughout the material. This interaction creates a partially filled valence band, which functions as a conduction band. Because these electrons are mobile and delocalized, they can efficiently transport both electrical charge and thermal energy through the metal.21