Gold, Physics

Gold:                        

Atomic number

79

Symbol

Au

Atomic weight

196.9665

discovery

Known since prehistoric time

Electrical configuration

[Xe]6s'4f145d10

Word origin

Sanskrit, jwal: meaning gold also Latin aurum, shining drawn.

Melting point

1064.430C

Boiling point

27000C

Specific gravity

18.88 (200C)

Electrical resistivity

2.2*10-8 ohm-m

Properties:

1.      In mass, gold is a yellow coloured metal, although it may be black, ruby, or purple when finally divided.

2.      It is one of the stable metals and it is very light and soft.

3.      It is a malleable and ductile and can be easily beaten into translucent sheets as thin as 0.00001mm.

4.      It is a good conductor of electricity and heat. It is not affected by exposure to air or to most reagents.

5.      It is inert and good reflector to infrared radiation.

6.      It is very soft and cannot be used in pure form. So, it is usually alloyed to improve its resistance to mechanical wear and to impact hardness.

7.      It is highly corrosion resistant which makes it alloy very much useful as contact materials in electric field.

Uses:

1.      Gold is used in coinage and is the standard for many monetary systems.

2.      It is used for jewellery, dental work, plating and reflectors.

3.      Chlorauric acid is used in photography for toning silver images.

4.      Disodium aurothiomalate administered intramuscularly is a treatment for arthritis.ents

5.      It is extensively used to make contacts on very sensitive devices where clean contact surface is essential. It is also used in inter connections within the integrated circuits.

Sources: Gold is generally found in veins among rocks and ores of other metal. It is also found in the form of dust in the beds of rivers. Gold is widely distributed and almost always associated with pyrite or quartz.

Posted Date: 7/21/2012 7:46:23 AM | Location : United States







Related Discussions:- Gold, Assignment Help, Ask Question on Gold, Get Answer, Expert's Help, Gold Discussions

Write discussion on Gold
Your posts are moderated
Related Questions
Explain Electricity and static electricity Electricity - study of stationary (static) or moving charges Static Electricitiy (Electrostatics) - electric charges at rest

A 350-Hz tuning fork is held over the end of a pipe that is inserted into water. What is the spacing between the resonance lengths of the pipe if the speed of sound is 348 m/s

how rotational motion was investigate

Q. Why nichrome is used as heating element in electric heating devices? Nichrome, an alloy of nickel as well as chromium is used as the heating element for the following reaso


Does the force constant of a spring changes if it is cut into parts? Ans) Force constant does not change because it is a constant

Gauss' law for magnetic fields The magnetic flux by a closed surface is zero; no magnetic charges present. In differential form, div B = 0.

explaion of perpendicular axis theorem

what pressure is created when 2.0 liters of air are forced into a bicycle tire originally at atmospheric pressure and containing 0.45 liter of air? the inside volume of the tire re

1.    Explain the basic features of electricity at a fundamental level? ( Describe the nature of electricity)   2.    What part of a cable are conductors and insulators? (Recogini