What is Au? Important knowledge about Au.

Definition of Au
Au is the chemical symbol for gold, a chemical element in the periodic table with atomic number 79.
1.1 Names
1.1.1 Common name: Gold
1.1.2 English name: Gold
1.2 Atomic mass: 197 u
1.3 Atomic weight: 79 u
1.3.1 Molecular structure: Gold is a pure element, does not form molecules.
1.4 Ion structure: Gold can form Au+ or Au₃+ ions.

Properties of Au
2.1 Physical properties of Au:
State: solid at room temperature
Color: Gold
Smell: None
pH: Not applicable as gold is insoluble in water.
2.2 Chemical properties of Au: Gold is very inert, meaning it reacts little with other chemicals.

Common chemical reactions with Au:
Gold is very inert and does not react with many chemicals.
Non-metal reaction: Au + Cl₂ -> AuCl₃(reactionwithchlorinetoformgold(III)chloride)

Preparation of Au
4.1 Lab preparation of Au: Gold cannot be prepared in the laboratory as it is an element.
4.2 Industrial preparation of Au: Gold is mined from gold-containing ores, then extracted through chemical and physical methods such as lead refining, steam refining or electrolysis.