Gold is a chemical element found on the periodic table with the symbol Au and atomic number 79. It belongs to Group 11 and is classified as a transition metal. A gold atom contains 79 protons and, in its most common isotope, 118 neutrons. At room temperature, gold is a solid metal with a density of approximately 19.3 g/cm³ and a melting point of 1,064°C. Its distinctive yellow colour is caused by the way its electrons interact with visible light.
Gold has several unique physical and chemical properties. It is highly malleable and ductile, meaning it can be shaped into extremely thin sheets or drawn into fine wires without breaking. It is also an excellent conductor of electricity and heat. Unlike many other metals, gold is highly resistant to oxidation and corrosion because it is relatively unreactive. Its electron configuration is Xe 4f¹⁴ 5d¹⁰ 6s¹, which helps explain some of its chemical behaviour.
Gold has numerous applications in modern science and technology. In electronics, it is used in connectors and circuit boards because of its excellent electrical conductivity and resistance to corrosion. In medicine, certain gold compounds are used in specialised treatments and scientific research. Gold is also used in dentistry, aerospace technology and nanotechnology. Its combination of chemical stability, conductivity and physical flexibility makes it an extremely useful element in many scientific and industrial fields.
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