The chemical symbol for gold is Au. The name Au comes from a story about Aurora (Aurora), the goddess of dawn in Roman mythology, meaning a shining dawn. Gold, on the other hand, means “dawn” in Latin, and means “the sun that can be touched” in ancient Egyptian characters.

The chemical properties of gold are very stable. Generally, whether it is dilute or concentrated hydrochloric acid, nitric acid, or sulfuric acid, it cannot be dissolved when used alone; however, gold is soluble in aqua regia (a 3:1 mixture of hydrochloric acid and nitric acid), and gold and aqua regia chemically form tetrachloroauric acid. Tetrachloroauric acid is extremely corrosive, and it can corrode all metals.

The chemical stability of gold means that it will not rust or corrode over time. Even after being buried underground for hundreds of years, gold can maintain its sparkling appearance, which is why ancient people regarded gold as a symbol of immortality.