Silver has been known to mankind in IV millennium BC.In ancient Egypt, it was even called "white gold."This precious metal is found in nature in its native form or in the form of compounds such as sulfides.Silver nuggets are heavy and often contain traces of gold, mercury, copper, platinum, antimony and bismuth.
chemical properties of silver.

Silver belongs to the group of transition metals and has all the properties of metals.However, the reactivity of silver is small - in the electrochemical electrochemical series of metals, it is the right of hydrogen near the end.The silver compound often has an oxidation state one.
Under normal conditions, the silver does not react with oxygen, hydrogen, nitrogen, carbon, silicon, but it reacts with sulfur to form silver sulfide:
2Ag + S = Ag2S.When heated, the silver reacts with halogens: 2Ag + Cl2 = 2AgCl ↓.
soluble silver nitrate AgNO3 used for the qualitative detection of halide ions in solution - (Cl-), (Br-), (I-): (Ag +) + (Hal -) = AgHal ↓.For example, the interaction with the anions of chlorine silver gives an insoluble white precipitate AgCl ↓.
Why silverware darken the air?

reason gradual darkening silverware because the silver reacts with hydrogen sulfide in the air.As a result, on the surface of the metal film is formed Ag2S: 4Ag + 2H2S + O2 = 2Ag2S + 2H2O.
As silver reacts with acids?

with diluted hydrochloric and sulfuric acids, silver, copper and the like, does not react, because the metal is of low activity, and can not displace one hydrogen.Acid-oxidants, nitric and concentrated sulfuric acid dissolved silver: 2Ag + 2H2SO4 (conc.) = Ag2SO4 + SO2 ↑ + 2H2O;Ag + 2HNO3 (conc.) = NO2 ↑ + AgNO3 + H2O;3Ag + 4HNO3 (dil.) = 3AgNO3 + NO ↑ + 2H2O.
If a solution of silver nitrate to add the alkali to give a dark brown precipitate of silver oxide Ag2O: 2AgNO3 + 2NaOH = Ag2O ↓ + 2NaNO3 + H2O.
As cuprous compounds, insoluble precipitates of AgCl and Ag2O are soluble in solutions of ammonia, giving the complex compounds: AgCl + 2NH3 = [Ag (NH3) 2] Cl;Ag2O + 4NH3 + H2O = 2 [Ag (NH3) 2] OH.Last compound frequently used in organic chemistry in the reaction of the "silver mirror" - a quality response to the aldehyde group.