Beryllium is mostly used by its self or as an alloy.  It does however form compounds with non-metals to make toxic salts.  

Beryllium Salts

Beryllium Oxide – Used as a base material in Nuclear Reactors, because it is a highly effective moderator and reflector for neutrons. 

Beryllium Alloys

Physical Properties of Beryllium:  Beryllium has a steel gray color and is one of the lightest metals.  Beryllium also has good dimensional stability, and elasticity.  Beryllium is non-magnetic and an excellent conductor of heat.

Beryllium Copper  - used for making springs, electrical contacts, and non sparking tools because the copper alloy creates a high elasticity, and will not spark against other metals.

Beryllium Aluminum – Used in aviation and space travel to make the frames of the vehicles.  Also used to make some of the tools that are used in space. Beryllium Aluminum is used in these things because it retains it shape very will and is resistant to heat. It is also very light allowing things that fly, such as airplanes and space ships, to take off and fly easier than if they were weighed down with a heavy metal frame.

Pure Beryllium – Used in computer parts,  in nuclear weapons, and in x-ray windows because it transmits x-rays 17 times better than Aluminum. Beryllium is used in computer parts because it is lightweight and has good dimensional stability. It is used in nuclear weapons because it is a good reflector of nuetrons which will maximize the power of the explosion.