<Tr> <Td> R - phrases (outdated) </Td> <Td> R36, R37, R38 </Td> </Tr> <Tr> <Td> NFPA 704 </Td> <Td> 0 0 </Td> </Tr> <Tr> <Td> Flash point </Td> <Td> Non-flammable </Td> </Tr> <Tr> <Td_colspan="2"> US health exposure limits (NIOSH): </Td> </Tr>

Determine the oxidation state of magnesium in mgo