<Tr> <Td_colspan="7"> down - type quarks </Td> </Tr> <Tr> <Td> down </Td> <Td> d </Td> <Td> ⁄ </Td> <Td> − ⁄ </Td> <Td> 3.5 to 6.0 </Td> <Td> ~ 10 electrons </Td> <Td> antidown </Td> <Td> d </Td> </Tr> <Tr> <Td> strange </Td> <Td> s </Td> <Td> ⁄ </Td> <Td> − ⁄ </Td> <Td> 70 to 130 </Td> <Td> ~ 200 electrons </Td> <Td> antistrange </Td> <Td> s </Td> </Tr> <Tr> <Td> bottom </Td> <Td> </Td> <Td> ⁄ </Td> <Td> − ⁄ </Td> <Td> 4130 to 4370 </Td> <Td> ~ 5 protons </Td> <Td> antibottom </Td> <Td> </Td> </Tr>

Matter is made up of atoms chapter 2 understanding concepts part b