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.
The defect allows oxygen-rich blood from the left ventricle to mix with oxygen-poor blood in the right ventricle. An infant who is born with a VSD may have one or more holes in the wall that separates the two ventricles. The defect also may occur alone or with other congenital heart defects. Doctors will classify a VSD based on the: 1  Size of the defect. 2  Location of the defect.