* Sodium's Reactivity: Sodium (Na) is a highly reactive alkali metal. When added to water, it reacts violently, producing hydrogen gas (H2) and sodium hydroxide (NaOH). The rapid formation of hydrogen gas causes the fizzing.
* Sodium Chloride's Stability: Sodium chloride is an ionic compound, meaning it's already in a stable form. When dissolved in water, it simply dissociates into sodium ions (Na+) and chloride ions (Cl-). No new chemical reactions occur that would generate gas bubbles.
In summary: Sodium fizzes in water because of a chemical reaction that releases hydrogen gas. Sodium chloride, being already in a stable compound form, does not undergo such a reaction.
