It's atomic number is four. Its atomic mass is 9.01218. The protons have the same number of the atomic number, four. There are only four electrons, and there are four neutrons. The symbol for Beryllium is Be.
Beryllium is high melting and light weight.
It is corrosion-resistant, it is also a steel gray color. Beryllium is used in copper alloy used for springs, electrical contacts, and non sparkling tools. It is also used for aerospace structural material as a moderator and reflector in nuclear reactors. It has the ability to absorb large amounts of heat, that makes Beryllium also useful for spacecrafts, missiles and aircrafts. Beryllium doesn't mix with acids or strong bases.