Group one metals are very reactive metals, they can react with the tiniest water molecules in air. That’s reason why they have to be stored under oil. Also they bare the vertical column on the left hand side of the periodic table. The following metals are in group one:

lithium=Li

sodium=Na

potassium=k

robidium=Rb

cisium=cs

francium=Fr

when lithium reacts with water it flows and fizzes until it becomes smaller and disapers.

lithium +water=lithium hydroxide+hydrogen