Just because real gold is not afraid of fire does not mean that gold cannot be melted by fire. Because gold has high chemical stability and is not easy to react with other substances, there is no need to worry about oxidation and discoloration. Even if it is burned, it will not react with the air and will not change color, so it still shines.

Gold is a metallic element, its chemical symbol is Au, and its atomic number is 79.

The simple substance (free form) of gold, commonly known as gold, is a precious metal, which has been used as currency, preservation and jewelry for many centuries. In nature, gold exists in the form of simple substance in gold nuggets or rocks, underground veins and alluvium. Gold is also one of the currency metals. Gold is solid at room temperature, with high density, softness, brightness and corrosion resistance. It is the metal with the best ductility, second only to platinum.

Gold is a transition metal, which can form trivalent and monovalent positive ions after dissolution. Gold will not react with most chemicals, but will be corroded by chlorine, fluorine, aqua regia and cyanide. Gold can be dissolved by mercury to form amalgam (but this is not a chemical reaction); Nitric acid can dissolve silver and alkali metals, but not gold.

Pure gold is tasteless because it is very resistant to corrosion (the taste of other metals comes from metal ions). In addition, the density of gold is quite high, and the weight of one cubic meter of gold is 19.320 tons. In contrast, the density of lead is 1 1.340 g/cm3, and the element with the highest density is osmium, with the density of 22.66 1 g/cm3. High purity gold single crystal can reflect infrared rays.