Gold Facts

Gold Facts
Gold (Au) has an atomic number of seventy-nine, and seventy-nine protons in the nucleus of its atom. This typically yellow metal is the most malleable of the metal elements and alloys readily with other metals to form different colored variations.
Interesting Gold Facts:
Gold was in use by ancient civilizations and already was highly valued at that time.
The oldest known piece of gold jewelry dates back to the Mesopotamians in 2600 BC.
The Etruscans used gold to replace or secure teeth as early as 700 BC.
The malleability of gold allows for one gram of the element to be hammered to as much as 300 square feet.
This property makes gold very popular in gold leafing.
Due to this softness, gold is often alloyed with other elements.
An estimated 171,000 tons of gold have been mined by humans.
It is one of the highest atomic numbered elements to appear naturally and in its free state.
It is believed that most of the gold on Earth is at the core level, sinking when the planet was still molten.
Most of the gold retrievable from the crust is believed to have been as a result of meteorite bombardment about four billion years ago.
An estimated fifteen thousand tons of gold are in the oceans.
Gold is believed to be concentrated in ocean water at between ten and thirty parts per quadrillion.
Gold synthesis from seawater has been attempted over the years, but has not proven economically feasible.
Gold only has one stable isotope, Au-197.
This stable isotope is also its only naturally occurring isotope.
There have been thirty-six synthetic radioactive isotopes of gold.
Gold has a density greater than lead, and about midway between lead and osmium, the densest metal element.
While gold is prized for jewelry making and for investing, it is actually a good conductor of heat and electricity and therefore has electronics applications.
Gold has also uses in medicine, gourmet foods, and the commercial chemistry industry.
About half of all gold ever produced has come from mines in South Africa.

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