Astatine, a radioactive chemical element. Astatine, a member of the halogen group of elements, is an extremely shortlived substance; its most stable isotope has a half-life period of only 8.3 hours.
Chemical elements are substances composed of only one type of atom and they cannot be broken down further. Chemical elements are the simplest forms of matter and each one is assigned a specific atomic number. Check out these articles on chemical elements.
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