Beryllium is a chemical element with the symbol Be and atomic number 4. It's a relatively rare element in both the universe and on Earth, and it's known for its stiffness, light weight, and resistance to heat.
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Atomic Mass: The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom.
Alkaline Earth Metals: A group of chemical elements in the periodic table with very similar properties. They are all shiny, silvery-white metals that includes beryllium.
Periodic Table: A tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring properties.