Question

chemical properties of gold​

Answer 1

The term gold comes from a Latin word aurum, that means shining dawn. This Latin term gives rise to its chemical symbol Au. The following table will cover some of the general properties of the element gold.

General Properties of Gold

Chemical Symbol Au

Atomic Number 79

Elemental Characteristic Transition metal

Elemental group, period and block 11, 6, d

Melting Point 1337.33 K

Boiling Point 3129 K

Isotopes 1

Electrochemical Equivalent 2.4496g/amp-hr

Occurrence in Nature

Gold has a wide distribution within the earth, especially in areas under the oceans and sea. It is found in the form of dust, grains, flakes, or nuggets. The chemical element of gold occurs by amalgamation of mercury and silver. It also forms telluride minerals in its compound form with tellurium.

Answer 2

Answer:

Explanation:

Atomic number

79

Atomic mass

196.9655 g.mol -1

Electronegativity according to Pauling

2.4

Density

19.3 g.cm-3 at 20°C

Melting point

1062 °C

Boiling point

2000 °C

Vanderwaals radius

0.144 nmIonic 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

Gold is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength. It is a good conductor of heat and electricity, and is unaffected by air and most reagents. Gold is usually alloyed in jewellery to give it more strength, and the term carat describes the amount of gold present (24 carats is pure gold). It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. on a side. The most common gold compounds are auric chloride (AuCl3) and chlorauric acid (HAuCl4). A mixture of one part nitric acid with three of hydrochloric acid is called  aquaregia (because it dissolved gold, the King of Metals). It is unaffected by air and most reagents.