DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Gold nugget. Gold is most commonly found naturally as a free metal called native gold. It once formed the basis of monetary systems and is used as jewellery, due to its rarity, attractive appearance and lack of tarnishing. Gold has an atomic number of 79 and a relative atomic mass of 196.97.
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