Here's why:
* Location on the Periodic Table: Alkali metals are found in Group 1 of the periodic table.
* Electron Configuration: They have only one valence electron, which they readily lose to form a +1 cation. This makes them very eager to react with other elements.
* Reactivity Trends: As you move down the group, the reactivity of alkali metals increases. This is because the outermost electron is further from the nucleus and more easily removed.
Examples of alkali metals include:
* Lithium (Li)
* Sodium (Na)
* Potassium (K)
* Rubidium (Rb)
* Cesium (Cs)
* Francium (Fr)
These metals react violently with water, oxygen, and other nonmetals. They are typically stored under oil to prevent them from reacting with the air.
