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Properties of gold

One of the reasons for gold’s high value is the properties that are unique to it. It’s colour, lustre and rarity all make gold attractive to people, but the physical and chemical properties help elevate it to something more than just a shiny metal for jewellery and coins.
A gold nugget .

What are the properties of gold?

Many of the physical properties of gold are well known; the bright, shiny yellow colour, and its incredible density have both captured the attention of people for thousands of years.

Gold is one of the ‘noble’ metals and is virtually chemically inert; it reacts with almost nothing. As such, 80% of gold found within ores is in its elemental state. This is also why gold does not tarnish over time, but it can make it difficult to refine. Most acids have little effect on gold, but Aqua Regia – a highly concentrated mix of nitric acid and hydrochloric acid – can dissolve it. Toxic chemicals like Mercury and Cyanide can also be used to form amalgams with gold, but environmental concerns mean these are prohibited or strictly regulated.

Gold only has one stable isotope – 197 Au – with other radioisotopes and nuclear isomers decaying over time. Thanks to the progress of nuclear physics, the ancient goal of alchemy (the transmutation of other chemical elements into gold) is now possible. Japanese physicist Hantaro Nagaoka successfully synthesised gold from mercury in 1924, finally solving the centuries old conundrum.

Today, mercury and platinum can be turned into gold through irradiation. This process however is unviable for large scale production, and synthesis of alternatives to gold unlikely, meaning that gold will continue to be rare for years to come.

Gold’s unique properties mean that it is also incredibly useful. Learn more about the uses of gold HERE.


Chemical properties of gold

Chemical properties of gold .

Chemically speaking, gold is a very unique element. With a high electrical conductivity, high melting point, low reactivity, and high ductility, gold is ideal for electronics and as such is used extensively in industries worldwide. An ounce of gold can be stretched into a wire 2000 km long with a thickness of 1 µm (micrometer)!

Below are just some of the amazing (but highly technical) properties of gold that make it so special and irreplaceable in our society.

  • Atomic Number: 79
  • Atomic Weight: 196.967
  • Density: 19.3 grams per cubic centimetre
  • Melting Point: 1064 ˚C
  • Molar Volume: 10.21 cubic centimetres
  • Young’s Modulus: 78 GPa
  • Rigidity Modulus: 27 GPa
  • Poisson’s Ratio: 0.44
  • Electrical Resistivity: 2.2 x 10 -8 Ω m
  • Reflectivity: 95%