<Table> <Tr> <Td> Smallest recognized division of a chemical element </Td> </Tr> </Table> <Tr> <Td> Smallest recognized division of a chemical element </Td> </Tr> <Tr> <Th> Properties </Th> </Tr> <Tr> <Td> <Table> <Tr> <Td> Mass range: </Td> <Td> 6973167000000000000 ♠ 1.67 × 10 to 6975452000000000000 ♠ 4.52 × 10 kg </Td> </Tr> <Tr> <Td> Electric charge: </Td> <Td> zero (neutral), or ion charge </Td> </Tr> <Tr> <Td> Diameter range: </Td> <Td> 62 pm (He) to 520 pm (Cs) (data page) </Td> </Tr> <Tr> <Td> Components: </Td> <Td> Electrons and a compact nucleus of protons and neutrons </Td> </Tr> </Table> </Td> </Tr>

The number of protons and neutrons in an atom is that atom's