Element Name: Silver
Element symbol: Ag
Elements of the English name: Silver
Atomic number: 47
Relative atomic mass: 107.868
Atomic volume: (cc / mol) 10.3
Color and status: silver-white metal
Mohs hardness: 2.5
Physical properties
Density: 10.53 grams / cubic centimeter (20 ℃)
Melting point: 961.78 ℃
Boiling Point: 2213 ℃
Melting heat: 11.30 kJ / mole
Heat of vaporization: 250.580 kJ / mole
Reflectivity: 91%
Have good flexibility and extensibility, scalability, second only to gold, to press into sheets, pull into filaments. 1 gram of silver can pull into a 1800 meters long filaments can be rolled into a thickness of 1 / 100000 millimeters of the foil, the conductivity and thermal conductivity of the metal the best.
Crystal structure: face-centered cubic unit cell for unit cell, each cell containing four metal atoms.
Apply
Silver is a beautiful silver-white metal, it has very good scalability, and its electrical conductivity and heat transfer in all of the metals are the highest.
For example, if the electrical conductivity of mercury to 1, the electrical conductivity of copper is 57, while the conductivity of silver for 59, top the list. Therefore, the silver used to produce extremely high sensitivity of the physical equipment components, a variety of automation devices, rockets, submarines, computers, nuclear devices and communication systems, all of these devices are a large number of contact points of silver production. In the use of the period, each contact point to the work of millions of times, must be reliable and wear-resistant, can withstand the rigorous demands of work, silver fully able to meet various demands. If the rare earth elements added to silver, the more excellent performance. This increases the production of rare earth elements of the silver contact points, life can be extended several times.
Element use:
For the system of alloys, welding medicine, silver, silver, chemical equipment, etc., and for the system at the end of silver and silver and so on.
The most important silver compound is silver nitrate. On the medical front, the aqueous solution of silver nitrate used for eye drops, because silver ions can kill bacteria strongly.
|
