Electrum is a metal alloy mainly consisting of gold, silver and traces of some other metals. This naturally occurring alloy has a long history of being used for making coins, vessels and also for coatings. It was referred to as âgoldâ or âwhite goldâ by ancient Greeks.
In Interstitial defect, atom occupies the interstitial space of the lattice structure of solid crystal. In Substitutional defect, the foreign atom occupies only the lattice site of a crystalline solid. Interstitial defect may occur by the atoms of either same solid (called self-interstitial) or foreign material. Substitutional defect is always caused by foreign atoms.
Congenital disorder, also known as congenital disease, birth defect or anomaly, is a condition existing at or before birth regardless of cause.Of these diseases, those characterized by structural deformities are termed congenital anomalies and involve defects in a developing fetus.Birth defects vary widely in cause and symptoms. Any substance that causes birth defects is known as a teratogen.f these diseases, those characterized by structural deformities are termed congenital anomalies and involve defects in a developing fetus. Birth defects vary widely in cause and symptoms. Any substance that causes birth defects is known as a teratogen.