Alkali metals are a group of elements found in Group 1 of the periodic table. The most common examples of alkali metals include:
- Lithium (Li)
- Sodium (Na)
- Potassium (K)
- Rubidium (Rb)
- Cesium (Cs)
- Fructium (Fr) (though it is highly radioactive and less commonly encountered)
These metals share similar properties, such as being highly reactive, especially with water, and they tend to form strong alkaline hydroxides when they react. They are characterized by having a single electron in their outermost shell, making them eager to lose that electron and form positive ions. Due to their reactivity, alkali metals are not found freely in nature and are typically stored in mineral deposits or under oil to prevent them from reacting with moisture in the air.