Silver is a metallic chemical element with the chemical symbol Ag and atomic number 47. It has a relative atomic mass of 107.870, a melting point at 960.8℃, a boiling point at 2210℃, a density of 10.50 g/cu.cm.(at20℃), a fusion heat at 11.40 kJ.mol and a heat of vaporization at 25.20 KJ.mol.

Silver is soft, has good flexibility and its ductility is the second-best, only after gold. It can be pressed into thin slices, pulled into filaments – 1 gram of silver can be pulled into filaments with a length of 1800 meters, or rolled into a silver foil with a thickness of 1 / 100,000 mm.

Silver has the highest electric and thermal conductivity of any metal. Silver is also among metals that have the highest optical reflectivity, with reflectivity rate of 91%.

Silver has inactive chemical properties. It does not react with oxygen at room temperature.  Silver is a relatively stable element. When it is exposed to air for a long time, silver would react with hydrogen sulfide in the air, forming a black layer of silver sulfide. At room temperature, the halogen and silver would slowly react to form silver halide.  Sliver would react with strong oxidizing acid (concentrated nitric acid and hydrochloric acid).  Silver powders are soluble in oxygenated cyanide solution and oxygenated acidic thiourea solution.

Silver has a good resistance to alkali. Silver exits as monad in chemical compounds and can form compounds with a variety of substances.