- Alkali metals belongs to the first group of periodic table.
- They are Lithium, Sodium, Potassium, Rubdium, Cesium and Francium.
- They are represented by the symbols Li, Na, K, Rb, Cs, and Fr respectively.
- Down the group the electropositivity increases.
- Electropositivity means electron releasing tendency of a metal.
- When we compare the reactivity of LI and Fr with water, the later is more reactive than the former.
- On exposure to air, its metallic lustrue is darkened.