<Tr> <Td> <P> </P> </Td> </Tr> <P> (eq. 1 . 2) </P> <Dl> <Dd> <Table> <Tr> <Td> <P> NO 2 + O 2 → h ν NO + O 3 (\ displaystyle (\ ce ((NO2) + (O2) -> (h \ nu) (NO) + (O3)))) </P> </Td> <Td> <Table> <Tr> <Td> <P> </P> </Td> <Td> <P> </P> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> <P> </P> </Td> </Tr> </Table> </Td> <Td> <P> (eq. 1 . 3) </P> </Td> </Tr> </Table> </Dd> </Dl> <Dd> <Table> <Tr> <Td> <P> NO 2 + O 2 → h ν NO + O 3 (\ displaystyle (\ ce ((NO2) + (O2) -> (h \ nu) (NO) + (O3)))) </P> </Td> <Td> <Table> <Tr> <Td> <P> </P> </Td> <Td> <P> </P> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> <P> </P> </Td> </Tr> </Table> </Td> <Td> <P> (eq. 1 . 3) </P> </Td> </Tr> </Table> </Dd>

Which of the following is a characteristic of free radicals ​