Beryllium
Chemical element
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Beryllium is a chemical element; it has symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. It is a divalent element that occurs naturally only in combination with other elements to form... Wikipedia
Symbol: Be
Atomic number: 4
Atomic mass: 9.012182 u
Electron configuration: [He] 2s²
Discoverer: Louis Nicolas Vauquelin
Electrons per shell: 2,2
Melting point: 2,348°F (1,287°C)