0
Gold
Atomic Number: 79
Symbol: Au
Atomic Weight: 196.9665
Discovery: known since prehistoric time
Electron Configuration: [Xe]6s14f145d10
Word Origin: Sanskrit Jval; Anglo-Saxon gold; meaning gold - also Latin aurum, shining dawn
Isotopes: There are 18 isotopes of gold. Gold-198, with a half-life of 2.7 days, has been used to treat cancer and other illnesses.
Density (g/cc): 19.3
Melting Point (°K): 1337.58
Boiling Point (°K): 3080
Appearance: soft, malleable, yellow metal
Atomic Radius (pm): 146
Atomic Volume (cc/mol): 10.2
Covalent Radius (pm): 134
Ionic Radius: 85 (+3e) 137 (+1e)
Specific Heat (@20°C J/g mol): 0.129
Fusion Heat (kJ/mol): 12.68
Evaporation Heat (kJ/mol): ~340
Debye Temperature (°K): 170.00
Pauling Negativity Number: 2.54
First Ionizing Energy (kJ/mol): 889.3
Oxidation States: 3, 1
Lattice Structure: Face-Centered Cubic (FCC)
Lattice Constant (Å): 4.080
Specific Gravity (20°C): 18.88
Properties: The melting point of gold is an assigned value, which serves as a calibration point for the International Temperature Scale and International Practical Temperature Scale. In mass, gold is a yellow-colored metal, although it may be black, ruby, or purple when finely divided. Gold is the most malleable and ductile metal. One ounce of gold can be beaten out to 300 ft2. Gold is a good conductor of electricity and heat. It is not affected by exposure to air or to most reagents. It is inert and a good reflector of infrared radiation. Gold is usually alloyed to increase its strength. Pure gold is measured in troy weight, but when gold is alloyed with other metals the term karat is used to express the amount of gold present.
Uses: Gold is used in coinage and is the standard for many monetary systems. Gold is used for jewelry, dental work, plating, and reflectors. Chlorauric acid (HAuCl4) is used in Photography for toning silver images. Disodium aurothiomalate, administered intramuscularly, is a treatment for Arthritis.
Sources: Gold is found as the free metal and in tellurides. It is widely distributed and almost always associated with pyrite or quartz. Gold is found in veins and in alluvial deposits. Gold occurs in sea water in the amount of 0.1 to 2 mg/ton, depending on the location of the sample.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Physical facts about gold?
heavy,shiny,cold,hard... heavy,shiny,cold,hard...
When gold changes from a solid to a liquid is that a physical or chemical change?
It is a physical change (melting).
Is yellow gold in appearance an example of physical property?
Yes. color is a physical property.
What physical properties are used to separate salt from water?
the physical properties are gold and ice cream due to the salt being covered by the gold and the ice cream being in my belly.
What is the physical change when a gold coin is stamped with an eagle?
Compression.
Physical facts about gold?
heavy,shiny,cold,hard... heavy,shiny,cold,hard...
Is melting gold a physical or a chemical change?
Physical.
If a gold ignot is hammered into gold leaf is this a physical or chemical change?
You are not changing the gold into anything else, so it is merely a physical change.
Is the density of solid gold chemical or physical property?
The density of solid gold is physical property
Are nutrition facts a physical property?
Nutrition facts is chemical composition of a food.
Forming a bar of gold into wire chemical or physical?
When a gold bar is shaped into a wire, the gold's chemical properties do not change. Only the physical appearance changes when gold is changed in shape. Thus, this is an example of a physical change.
Is hammering gold into foil a physical or chemical?
physical
When gold jewelry is unaffected by perspiration chemical or physical?
when gold jewelry is unaffected by perspiration it is a physical property.
What are facts about the Hudson River in NY?
There is gold there
What are facts about locusts?
physical traits of a locusts
Is melting gold and pulls it into a wire physical or chemical?
These are physical changes.
Is non-flammable a physical property of gold?
melting point is a physical property for all elements (including gold)
