Why does sodium react so violently with water?
Quick Answer
Sodium is an alkali metal with one loosely held outer electron, so it reacts very quickly with water to form sodium hydroxide and hydrogen gas. The reaction is exothermic enough to make the hydrogen ignite.
The Full Story
Sodium sits in Group 1 of the periodic table, and its single valence electron is easy to lose. When sodium meets water, it forms sodium hydroxide and hydrogen gas almost immediately, releasing a lot of heat. That heat can melt the sodium into a ball and may ignite the hydrogen, which is why the reaction can look explosive. The same trend is seen in other alkali metals, with reactivity increasing down the group, and potassium usually reacts even more dramatically than sodium.
Key Facts
YouTube Angle
Suggested video title for this topic:
"One tiny sodium chip can explode on water—here’s why."