The chemical symbol of silver is Ag, atomic number 47, which belongs to a kind of transition metal. Among them, "999 and 925" is the abbreviation for silver content of silver ornaments, and sufficient silver 999 refers to the silver content of the purest silver ornaments (we all know that the world we live in is real, there can be no absolute 100% thing, the purest silicon in the world, that is 99.999.9%), and 999 silver is softer than other metals themselves. 925 silver actually refers to the silver containing 92.5% silver, adding other metals, resulting in 925 silver can do some meticulous silver ornaments. 925 is the international standard silver for silver ornaments.