Potassium is represented by the letter K on the periodic table, which comes from the Latin word kalium.

It was first discovered in its pure form in 1807 by Humphry Davy.

In its purest form, potassium is more reactive than sodium, and because of this, it does not exist in nature as a pure element.

Potassium is silvery-gray in color, tarnishes easily, and is soft enough to be cut with a butter knife—despite being a metal.

Pure potassium will actually explode in water.

The human body contains about 120 grams of potassium. It is essential for blood pressure regulation, muscle function, maintaining electrolyte balance, and reducing the risk of stroke. However, an overdose can cause a heart attack.

Potassium is typically stored in mineral oil to prevent it from decaying due to its high reactivity.

It is also a vital nutrient for plant growth and a common component in fertilizers.

In ancient times, potassium was used in soap making, where it was referred to as potash.

Potassium is slightly radioactive, but it does not emit ionizing radiation that is harmful. In fact, it contributes to some of the Earth’s natural background radiation.