BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY BIOSYM TECHNOLOGIES, INC. / SCIENCE PHOTO LIBRARY
Silicon. Molecular graphic of a hydrogen- terminated silicon wire, showing charge density and potential contours. Silicon atoms are yellow, hydrogen atoms are white. Charge density around the chemical bonds is shown in red. The purple grid shows potential contours around the atoms, and represents the molecule's true "physical" boundary.
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