Beryllium is in group 2 of the periodic table, so it is an alkaline earth metal. It is grayish (slightly gray) in color. It has an atomic number of 4 and is symbolized by the letters Be. It is toxic and should not be handled by anyone without proper training.
Beryllium has 4 electrons, 4 protons, and 5 neutrons.
Beryllium has one of the highest melting points of the light metals. It is added to other metals to make stronger alloys.
At standard temperature and pressures beryllium resists oxidation when exposed to oxygen.
Beryllium is best known for the chemical compounds it forms. Beryllium combines with aluminium, silicon and oxygen to make a mineral called beryl. Emerald and aquamarine are two varieties of beryl which are used as gemstones in jewelry.