<Table> <Tr> <Th> Helium atom </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Td> An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution (black). The nucleus (upper right) in helium - 4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case . The black bar is one angstrom (6990100000000000000 ♠ 10 m or 6990100000000000000 ♠ 100 pm). </Td> </Tr> <Tr> <Th> Classification </Th> </Tr> <Tr> <Td> <Table> <Tr> <Td> Smallest recognized division of a chemical element </Td> </Tr> </Table> </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> </Table> <Tr> <Th> Helium atom </Th> </Tr> <Tr> <Td> An illustration of the helium atom, depicting the nucleus (pink) and the electron cloud distribution (black). The nucleus (upper right) in helium - 4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case . The black bar is one angstrom (6990100000000000000 ♠ 10 m or 6990100000000000000 ♠ 100 pm). </Td> </Tr> <Tr> <Th> Classification </Th> </Tr>

Who said atoms of the same element are exactly like