<Tr> <Td> density (g / cm) </Td> <Td> 5.5 </Td> <Td> 5.35 </Td> </Tr> <Tr> <Td> melting point (° C) </Td> <Td> high </Td> <Td> 947 </Td> </Tr> <Tr> <Td> color </Td> <Td> grey </Td> <Td> grey </Td> </Tr> <Tr> <Td> oxide type </Td> <Td> refractory dioxide </Td> <Td> refractory dioxide </Td> </Tr>

Which elements would you use to predict the properties of ekasilicon