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Gold. For thousands of years, gold has been regarded as the finest and most precious metal known to man. In this CDA, I will try to find out why gold is so valuable.
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For thousands of years, gold has been regarded as the finest and most precious metal known to man. In this CDA, I will try to find out why gold is so valuable.
Gold is a metal which has had many purposes over the thousands of years. It has been used for jewellery, money, decoration and, more recently, in tooth fillings and electronics. It's a soft, yellow, metal with useful thermal and electrical properties. Unlike other metals like silver and copper, gold does not tarnish over time and use. Tarnish is a dark layer which forms over some metals such as copper, brass and aluminium. It is very dense metal, at 19.32 g/cm3. To give you an idea of just how heavy gold is, think of it this way: the mass of 1 litre of water is 1 kilogram. The mass of 1 litre of gold is 19.32 kilograms. Imagine carrying a 1-litre water bottle that weighs over 3 stone. The colour of gold is also called gold. It has an atomic number of 79, and a relative atomic mass of 196.97. The symbol for gold
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""John Plowright. Teacher. Repton School. Derbyshire.
""Telim Dars. Chemistry, Physics and English Literature. A Level Student.