<Tr> <Th> at T (K) </Th> <Td> 1646 </Td> <Td> 1814 </Td> <Td> 2021 </Td> <Td> 2281 </Td> <Td> 2620 </Td> <Td> 3078 </Td> </Tr> <Tr> <Th_colspan="2"> Atomic properties </Th> </Tr> <Tr> <Th> Oxidation states </Th> <Td> 5, 3, 2, 1, − 1, − 2, − 3 ​ (an amphoteric oxide) </Td> </Tr> <Tr> <Th> Electronegativity </Th> <Td> Pauling scale: 2.54 </Td> </Tr>

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