<P> Silicon is a chemical element with symbol Si and atomic number 14 . A hard and brittle crystalline solid with a blue - grey metallic lustre , it is a tetravalent metalloid and semiconductor . It is a member of group 14 in the periodic table , along with carbon above it and germanium , tin , and lead below . It is rather unreactive , though less so than germanium , and has a very large chemical affinity for oxygen ; as such , it was first prepared and characterized in pure form only in 1823 by Jöns Jakob Berzelius . </P>
<P> Silicon is a chemical element with symbol Si and atomic number 14 . A hard and brittle crystalline solid with a blue - grey metallic lustre , it is a tetravalent metalloid and semiconductor . It is a member of group 14 in the periodic table , along with carbon above it and germanium , tin , and lead below . It is rather unreactive , though less so than germanium , and has a very large chemical affinity for oxygen ; as such , it was first prepared and characterized in pure form only in 1823 by Jöns Jakob Berzelius . </P>
when was silicon added to the periodic table
when was silicon added to the periodic table
1823
1823