A proton is traveling with a speed of (6.550+/- 0.010)e5 m/s. With what maximum accuracy can its position be ascertained. I know that p=mv and x=p/h but what do I do with the +/- 0.010, that is the part that confuses me. How many electrons can be in the n=6, l=4 subshell. I know that l is n-1, so that can be 5, and n=6, so can the atom have 5 electrons?