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- Potassium is one of the alkali metals, which means it is a highly reactive, because of its high reactivity, potassium is not found free in nature.
Pure potassium is a silvery metal that is soft enough to cut with a knife. Potassium compounds emits a lilac or violet flame color when burned.
Pure Potassium usually is stored under oil or kerosene because of hoe reactive it is to the air and reacts in water to evolve hydrogen, which may be ignited from the heat of the reaction. It's symbol is K because it comes from the Latin word Kalium.