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(above) silicon #1 atoms arranged in a diamond-like atomic array
silicon: graphic showing the metalloid with atoms arranged in a diamond-like atomic array. Diamond crystal structure is a face centred cube with four additional atoms inside the cube. It is formed when an atom bonds to four neighbours which are positioned at the points of a regular tetrahedron. It is not a close packed arrangement. Silicon is used in semiconductors.
Image is 500 pixels across, the originals are 4096 pixels across.
(above) silicon #2 atoms arranged in a diamond-like atomic array
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