<Tr> <Th> Atomic number (Z) </Th> <Td> 34 </Td> </Tr> <Tr> <Th> Group </Th> <Td> group 16 (chalcogens) </Td> </Tr> <Tr> <Th> Period </Th> <Td> period 4 </Td> </Tr> <Tr> <Th> Element category </Th> <Td> reactive nonmetal, sometimes considered a metalloid </Td> </Tr>

What is the valence number of the element se