Because of their highly reactive nature with air and water, alkali metals are usually stored in oil.

Alkali metals have low densities make them able to float on water and they can be easily cut with a knife.

They react with water in which it produces hydrogen gas, it gets more reactive and explosive as it goes down the group.

They have low boiling points, they also have low melting points that decreases as it goes down the group.

Alkali Metals form positive ions by losing an electron to another atom which will be a negative ion through ionic bonding.