<Tr> <Th> Van der Waals radius </Th> <Td> 210 pm </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td_colspan="2"> Spectral lines </Td> </Tr> </Table> </Td> </Tr> <Table> <Tr> <Td_colspan="2"> Spectral lines </Td> </Tr> </Table> <Tr> <Td_colspan="2"> Spectral lines </Td> </Tr>

What are the characteristics and properties of silicon