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
As per the most established theory it is because of the rotation of the earth where by the several charged ions there in the molten state in the core of the earth rotate and consti

why does our image in the mirror not appear upside down

Atoms are particles of elements, substances that could not break down further. In examining atomic structure through, we have to clarify this statement. An atom cannot be broken do

The rate of change of angular velocity with related to time is known as angular acceleration.

how can i make project on human eye and its defects?

Factors affecting capacitance: The factors which affect the capacitance of a parallel-plate capacitor are: Overlapping area of the plates (A). The capacitance increases

In forced oscillation of a particle, the amplitude is maximum for a frequency  ω1 of the force while  the energy is maximum for a frequency  ω2 of the force, then what is relations

construction of nand gate?

In a vacuum tube, electrons accelerate from the cathode element to the plate element, which is maintained at a positive potential with respect to the cathode. If the plate voltage

A lever of the first class Saw off a stick or board so that it is the similar height as a heavy desk or table in the classroom. Place another stick about the similar length on