__ is a small component made of semiconductor material.
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Silicon
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The elemental semiconductors are those composed of single species of atoms, such as silicon (Si), germanium (Ge), and tin (Sn) in column IV and selenium (Se) and tellurium (Te) in column VI of the periodic table. There are, however, numerous compound semiconductors, which are composed of two or more elements.
Silicon atoms have four electrons which can be shared in covalent bonds with neighboring atoms. Silicon is the principal component of common sand, and for this reason it is less expensive than other intrinsic semiconductor materials.
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