Chemical properties of gold

It is extraordinarily ductile (degree of extension which takes place before failure of a material in tension). It is called a noble metal because it resists reacting with stuff. But it can be "convinced" to react, and it forms numerous compounds. Speaking of the halogens, the Group 17 elements, will react with gold and auric fluoride and auric chloride would be examples. it will form compounds in its +1 oxidation state with other ions, and it will also similarily form a number of compounds in the +3 oxidation state. It's oxidation states range from -1 to +5, with +1 and +3, Au(I) and Au(III), far and away the most commoni it  will dissolve in mercury, but creates an amalgam rather than react with it to create a compound. Aurum (gold) resists most acids, though aqua regia will attack gold, as will cyanide. In the unusual -1 state, gold will form compounds like CsAu.It will hook up with the most reactive of the Group 1 and Group 2 elements, the Alkali and Alkaline Earth elements. That's just the opposite of the Group 17 elements, the halogens (fluorine, chlorine, etcOne ounce can be drawn into 80 km (50 miles) of thin gold wire to make electrical contacts. There are also compounds (cluster compounds) where gold will form a compound that includes both the +1 and +3 oxidation states of the metal.
Chemical symbol for gold = Au
Atomic number = 79 (79 protons and electrons; 118 neutrons)
Number of naturally occurring isotopes = 1 (stable) (70 total possible)
Atomic radius = 0.1442 nm
Atomic mass = 196.96657 amu
Density = 19.3 g/cubic cm 
Specific gravity = 19.32 (Gold is one of the densest of all the chemical elements, compare to 7.87 for steel, 14.0 for mercury and 11.4 for lead.)
Melting point = 1064.43 ºC degrees
Boiling point (liquid to gaseous state) = 2807 °C
Crystal structure: FCC (cubic)
Thermal conductivity = 310 W m-1 K-1
Electrical resistivity = 0.022 micro-ohm m at 20°C
Youngs modulus = 79 GPa
Hardness = 2.5 (Mohs), 25 Hv (Vickers)
Tensile stress = 124 MPa