Possible Clues:

• Element used in integrated circuits
• Cornelius might be stupid enough, by the sound of it, to have only a chip of it
• Element is returned to the chemist symbolically
• Non-metallic element with atomic no. 14
• Chip substrate element
• It's used for making chips
• Element used as semiconductor
• Element in sand, quartz
• Trick sounds daft first, it's elementary
• Wrong to entertain lithium and cobalt as 'non-metal'