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Gold
Symbol:Au
Atomic number:79
Atomic mass: 196.97
Physical Propties Of Gold - Boiling Point: 3080K 2807C 5085F - Coefficient of lineal thermal expansion/K-1: 14.16E-6 # Conductivity - Electrical: 0.452 106/cm ohm Thermal: 3.17 W/cmK - Density: 19.32g/cc @ 300K - Description: - Soft bright yellow transition metal. - Elastic Modulus: * Bulk: 171/GPa * Rigidity: 26/GPa * Youngs: 78.5/GPa - Enthalpy of Atomization: 364 kJ/mole @ 25C - Enthalpy of Fusion: 12.55 kJ/mole - Enthalpy of Vaporization: 324.4 kJ/mole -Flammablity Class: -Freezing Point: see melting point -Hardness Scale -Brinell: 2450 MN m-2 -Mohs: 2.5 -Vickers: 216 MN m-2 -Heat of Vaporization: 334.4kJ/mol -Melting Point: 1337.73K 1064.58C 1948.24F -Molar Volume: 10.2 cm3/mole -Optical Reflectivity: 95% -Physical State (at 20C & 1atm): Solid -Specific Heat: 0.128J/gK -Vapor Pressure = 0.000237Pa@1064.58C
Chemical Properties of Gold Aomic number 79 Atomic mass 196.9655 g.mol -1 Electronegativity ccording to Pauling 2.4 Density 19.3 g.cm-3 at 20C Melting point 1062 C Boiling point 2000 C Vanderwaals radius 0.144 nm Ionic radius 0.137 nm (+1) Isotopes 7 Electronic shell [ Xe ] 4f14 5d10 6s1 Energy of first ionisation 888 kJ.mol -1 Energy of second ionisation 1974.6 kJ.mol -1 Standard potential +1,68 V ( Au+/ Au ) Discovered c.a. 3000 BC
Gold in its natural state
The Element Project
Gold Info
Uses of gold in our society: -For jewlery -For Industruial uses -Used in dentistry-for fillings etc. -Gold can also be used as a drug to treat minor medical problems. Since gold has the highest malleability out of all the metals (gold is a type of metal) it is smashed down into thin sheets creating some of our pricless jewlery.
Fun Facts: -You can make a sixty mile wire out of a single ounce gold! -The largest gold mining company in the United States is the Homestake Mining Company located at South Dakota. A way to tell the diffirence between real gold and fake gold is if the gold is ver soft like our fingernails when the fake kind is as hard as a knife blade.
