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.


Symbol Be
Atomic number 4
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.


Why isn't Be formed in stars?edit

Because it gets quickly depleted and fused into heavier elements.