Illustrated Glossary of Organic Chemistry

Empirical: Facts or evidence obtained by observation or experiment.

Diamond is composed of a network of carbon atoms joined by single bonds. VSEPR and other theories predict that the C-C-C bond angles in diamond are 109.5o. The empirical C-C-C bond angle in diamond (as determined via x-ray diffraction by physicists Sir William Lawrence Bragg and Sir William Henry Bragg in 1913), verifying the theoretical predictions. Click on the image to see a three-dimensional 'tour' through the diamond structure.