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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.
What else can I help you with?
Physical facts about gold?
heavy,shiny,cold,hard... heavy,shiny,cold,hard...
Is the shaping of a gold bar is an example of a purely physical change?
Yes, shaping a gold bar is an example of a physical change because the gold is not chemically altered during the process. Only its physical appearance and shape change.
What is golds physical state at room temperature?
Gold's physical state at room temperature is solid. That's one of the reasons why gold is widely used to make various jewelry pieces.
Is yellow gold in appearance an example of physical property?
Yes, the appearance of yellow gold is an example of a physical property because it can be observed and measured without changing the substance itself. Physical properties are characteristics that can be seen or measured without altering the composition of the material.
What physical property of gold can be determined by using mass and volume?
The density of gold can be determined by using its mass and volume. Density is a physical property that describes how tightly packed the material is. Gold has a relatively high density compared to other common metals.
Is melting gold a physical or a chemical change?
Physical.
Physical facts about gold?
heavy,shiny,cold,hard... heavy,shiny,cold,hard...
Is hammering gold into foil a physical or chemical?
physical
What are facts about the Hudson River in NY?
There is gold there
Are nutrition facts a physical property?
Nutrition facts is chemical composition of a food.
Is boiling gold a physical change?
Melting of gold for jewellery making is a physical change as no new substance is formed after melting. Changes in state or phase are physical changes.
Is melting gold and pulls it into a wire physical or chemical?
These are physical changes.
What are facts about the discovery of gold in 1815?
Gold was not discovered in 1815, it is known from prehistoric times.
Facts about the Olympics?
gold medals are not made from solid gold and 216 countries compete.
Is melting a sample of gold an example of a physical or chemical change?
Melting a sample of gold is an example of a physical change.
Is the density of solid gold chemical or physical property?
The density of solid gold is physical property
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.
