Silicon

Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent non-metal and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it.

It is relatively unreactive.
Silicon is a significant element that is essential for several physiological and metabolic processes in plants.
Silicon is widely used as a semiconductor material in various electrical devices such as transistors, solar cells, and integrated circuits.

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