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Gold - Aurum

Gold - Aurum. Hana Rachůnková Ludmila Šotolová. What's in the name?. Jval + Gold =» Aurum. Symbol : Au Atomic number : 79 Atomic weight : 196.96655 Group number : 11 Group name : Coinage metal Period number : 6. Block : d-block Melting Point : 1337 K (1064°C)

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Gold - Aurum

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  1. Gold - Aurum Hana Rachůnková Ludmila Šotolová

  2. What's in the name? Jval + Gold =»Aurum

  3. Symbol: Au Atomic number: 79 Atomic weight: 196.96655 Group number: 11 Group name: Coinage metal Period number: 6 Block: d-block Melting Point: 1337 K (1064°C) Boiling Point: 3129 K (2856°C) Density: 19.282 grams per cubic centimeter Gold

  4. Description • Standard state: solid at 298 K • Colour: gold • Classification: Metallic • Constitution: cubic system • Solidity: 2,5 • Ionization Energy: 9.226 eV • Oxidation States: +3, +1 • Availability: wire, foil, bars, jewellery

  5. History • gold has been known for at least 5500 years • gold is sometimes found free in nature but it is usually found in conjunction with silver, quartz (SiO2), calcite (CaCO3), lead, tellurium, zinc or copper • gold is the most malleable and ductile of all known metals • thin sheets of gold, known as gold leaf, are primarily used in arts and crafts for gilding

  6. Production A) Amalgamation B) Cyanideleaching: 4 Au + 8 NaCN + O2 + 2 H2O -> 4 Na[Au(CN)2] + 4 NaOH

  7. Purity • capacity of pure metal • pure gold has a purity 1000/1000 - 1000 segments from 1000 is pure gold For example: The purity 750/1000 contains 750 segments from thousand pure gold and 250 segments of ingredients

  8. Kinds of gold • Green gold • White gold and Pt • Red gold • Gold with Rh • Yellow gold • White gold

  9. Electron Shell Configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s1

  10. Crystal Structure

  11. Dictionary • availability – použitelnost, dostupnost • cubic system – krychlová soustava • solidity – tvrdost • malleable – kujný • ductile – tažný • gilded – pozlacený • purity – ryzost • leaf - destička

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