Gold - Aurum Hana Rachůnková Ludmila Šotolová

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

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

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

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

Production A) Amalgamation B) Cyanide leaching: yanideleachingyanideleaching 4 Au + 8 NaCN + O H 2 O -> 4 Na[Au(CN) 2 ] + 4 NaOH

Purity capacity of pure metal capacity of pure metal pure gold has a purity 1000/ segments from 1000 is pure gold pure gold has a purity 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 The purity 750/1000 contains 750 segments from thousand pure gold and 250 segments of ingredients

Kinds of gold 1. Green gold 2. White gold and Pt 3. Red gold 4. Gold with Rh 5. Yellow gold 6. White gold

Electron Shell Configuration Electron Shell Configuration 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 4f 14 5s 2 5p 6 5d 10 6s 1

Crystal Structure

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