Beryllium
As for the beryllium (Beryllium), as for the symbol of an element, it is Be in the one of the metallic elements. The atomic number is 4, and the atomic weight is about 9.012. The stable crystal has hexagonal close-packed structure structure (HCP) by normal temperature, ordinary pressure. As for specific gravity 1.85, as for the melting point, the boiling point is 2,970 degrees Celsius at approximately 1,300 degrees Celsius. In metal of the silver-white, an oxidation film is generated in the air by the surface, and there can be it for stability. The Mohs scale shows 7 from 6, and I am fragile at the normal temperature, but malleability, ductility rise firmly when they become the high temperature. I dissolve in both acid and alkali. The name called the beryllium comes from an emerald (beryl, Greek, beryllos). Because beryllium salts had sweetness, I was ever called a glucinium (from glykys meaning over-optimism in glucinium, Greek). A beryllium oxide was discovered from an emerald in 1797 by Louis = Nichola Isolating it was done for independence for further 1828 years by Frederick Bela and Antoine Bucy. Because an atomic radius is small, and the beryllium is hard to discharge an electron, I make the strong compound of the joint ownership associativity from an ion associativity. I mix around 2.0% with copper (Cu) from 0.15%, and it is used as beryllium copper compound metal. There is much than the copper more strongly the good electricity conductivity that is near to pure copper. The coefficient of expansion is near to stainless steel and steel (a steel). I have high magnetic permeability for a magnetic field changing slowly. In addition, there is the characteristic that light weight and strength are high, and the aluminum beryllium alloy is used for the part (safety, 2001, ban on use) of the F1 racing car and the part of the plane. Because the beryllium copper compound metal has high strength under the normal temperature, and the elasticity is big in high tensile strength, it is often that it is used for spring materials. In addition, there can be the thing that I use it for a tool to use in the explosion atmospheres such as the this purpose petrochemical industry by having the characteristic that a spark does not appear even if it is hard to make magnetization and receives a blow in security maintenance. In addition, the beryllium is considered to be indispensability in the field of radioactive rays. Because transmissivity for X-rays is very high, it is used for a X-ray source and a beam line, a window of the detection ingeniousness. I am important as neutron source discharging a neutron, and it is used as a neutron reflection moderator in the nuclear reactor by alpha rays irradiation. As for speed 8 that a sound is transmitted through the whole beryllium, there is an example used for a cantilever of the product made in Grace record needle unless it is used for the vibration board (mainly, dome type) of the upper register speaker of sound machinery makers such as Yamaha with 13km/s because I am considerably fast. It is generated by the cosmic rays which were incident on the earth atmosphere, and Be, Be are made most, and the quantity of generation is dependent on the dose of radioactivity of cosmic rays. Because I am sentenced to around 1 month in the troposphere in the stratosphere in around 1 in atmospheric stay time, and the Be had for in the ice core of the polar region records a solar activity change with C (carbon 14), it is used for analysis of past solar activity. In addition, atomic number 82 is the following even numbers, and the element without only one stable isotope is only beryllium. With an extremely toxic high material, I cause a serious chronicity lung disease to be known as beryllium lungs symptom when I enter the human body. Beryllium and the beryllium compound are urged with (Type1) cancer-causing than retainer organization IARC of WHO.