* High Reactivity: Alkali metals are the most reactive metals. They readily react with water to form hydroxides and hydrogen gas. This reaction is highly exothermic and can even be explosive.
* Abundance as Ions: Alkali metals exist in seawater primarily as dissolved ions, mainly as sodium (Na+) and potassium (K+). These ions are crucial for maintaining the chemical balance and biological processes in the ocean.
In summary:
* Alkali metals are too reactive to exist as pure elements in the presence of water.
* They are abundant in seawater, but only as dissolved ions.
