properties

Properties
 * Very reactive and electropositive
 * Second lightest known metal behind lithium
 * It is soft enough to be cut by a knife
 * rapidly oxidizes in air
 * must be perserved in mineral oil such as kerosene
 * decomposes in water with the evolutuion of hydrogen
 * catches fire on water
 * imparts a violet color to flames
 * obtained from minerals(carnallite)