Beryllium is an element of the periodic table with atomic number 4. It is a rare element and only occurs in compounds containing other elements naturally. In elemental form it is a lightweight and brittle alkaline earth metal. Some uses of it include aerospace components and particle detectors. It has only one stable isotope, namely 9Be . It has the electron configuration [He] 2s2.
|Atomic mass||9.012 g/mol|
|Melting point||1287 °C (1560 K)|
|Boiling point||2469 °C (2742 K)|
|Density||1.85 g/cm3 at r.t.|