Silicon is a member of Group 14 (IVA) in the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. Silicon is also part of the the carbon family. Other carbon family elements include carbon, germanium, tin, and lead. Silicon is a metalloid, one of only a very few elements that have characteristics of both metals and non-metals. Silicon is the second most abundant element in the Earth's crust, exceeded only by oxygen. Many rocks and minerals contain silicon.
circumscribe meaning, definition, what is circumscribe: to limit something: . Learn more.
Definition of circumstantial. 1  1 : belonging to, consisting in, or dependent on circumstances a circumstantial case circumstantial factors circumstantial evidence. 2  2 : pertinent but not essential : incidental Revolutions usually happen for both structural and circumstantial reasons. â A. M. S. Aly.