Question

Why do alkali metals tarnish on exposure to air?

Answer 1

• Alkali metals are the first elements in every period.
• These metals have the highest atomic size and lowest ionization potential in their respective periods.
• Due to this, the chemical reactivity of alkali metals is highest.
• On exposure to air, alkali metals vigorously react with air, moisture, and Carbon dioxide present in the air forming its oxides and hydroxides.
• The formation of oxides and hydroxides results into tarnishing.