Next-Gen

Gold

In Glogpedia

by 16acarter
Last updated 4 years ago

Discipline:
Science
Subject:
Chemical Elements
Grade:
9

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Gold

Gold (Au)

History

Element Symbol

Method

Artifacts of gold found in the cave cemetery of Nahal Kana were dated in the 1980's, and it was found that they were from the copper age. Artifacts found in Southeast Europe appear to be from the 4th millennium. Gold was first used as jewelry because of its shiny yellow colour.

Gold is primarily used in jewelry. Another use for Gold is in electronics, as its good conductivity and resistance to oxidation and corrosion has led gold to be commonly used as a thin layer on electrical connectors. In medieval times, gold was thought to be a medicine as people believed that something so beautiful and rare could not be anything but good for you. Gold alloys (gold mixed with other metals) are used in restorative dentistry.

Gold is a yellow coloured solid. Gold's melting point is 1064°C, and its boiling point is 2970°C. Gold is the single most malleable and ductile of all of the known metals. Gold's density is 19.32 g/cm3 which is 19.32 times more dense than water. Gold is the best conductor of heat of all the pure elements. Gold is an excellent conductor of electricity. Gold is completely unaffected by air, water, alkali metals, and all acids, with the exception of aqua regia. Gold however, does react with halogens. Gold is not combustible.

Societal Applications

Fun facts:- Most of the gold mined throughout history is in circulation in one form or another.- The biggest nugget of gold ever found weighed approximately 90 kilograms.- Pure gold is so soft it can be molded with your hands.- Gold is one of the heaviest metals on earth.- Very few chemicals react with gold, and that is why gold is still shiny after thousands of years.


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