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The remarkable workability of gold allows it to be transformed into incredibly delicate forms. For instance, a single gram of gold can be flattened into a sheet covering one square meter, or about 10.7 square feet. These extremely thin sheets, known as gold leaf, can be so fine they are nearly transparent, roughly 400 times thinner than a human hair. This unique characteristic is not just a curiosity; it has profound implications for its historical and modern uses.
The scientific explanation behind gold's exceptional malleability lies in its atomic structure and metallic bonding. Gold atoms are arranged in a face-centered cubic crystal structure, where each atom is surrounded by 12 neighbors (Review). In metals, the outermost electrons are delocalized, forming a "sea of electrons" that holds the positively charged metal ions together. This delocalized electron cloud allows the gold atoms to slide past each other relatively easily when pressure is applied, without disrupting the overall structure or breaking the metallic bonds. While other metals like copper and silver share a similar electron configuration, gold's malleability may also be attributed to the absence of oxide layers on its grain surfaces, which can make other metals more prone to fragmentation.
Throughout history, gold's incredible malleability has been leveraged by various civilizations. Ancient Egyptians, for example, used gold leaf extensively to decorate tombs, religious objects, and burial masks, with the famous mask of Tutankhamun being a prime example. The Romans also employed gold in sophisticated dentistry, crafting crowns and fixed bridgework. Today, this property remains crucial in diverse applications, from intricate jewelry and decorative arts to advanced electronics where it's used in connectors and contact points due to its conductivity and resistance to corrosion. Even in space exploration, gold-plated mirrors are used on spacecraft like the James Webb Space Telescope (Deals) to reflect infrared light.