ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Potassium metal. Freshly cut shiny surface of potassium metal. Potassium (K) is an alkali metal. It is soft enough to be cut with a knife. It reacts rapidly with water and oxygen in the air, therefore is usually kept in oil. Potassium is never found in its metallic form (free) in nature. However, it is an important component of rocks in the Earth's crust. It is essential for plant growth and is a vital element in the human diet.
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