The Table shows the relative mass and relative charge of four particles.
Table
| Particle | Relative mass | Relative charge |
|---|---|---|
| proton | 1 | +1 |
| neutron | 1 | 0 |
| electron | 11840\displaystyle \frac{1}{1840}18401 | -1 |
| positron |
Complete the Table for the positron.
A student says:
'A positron is the same as a proton because they both have a relative charge of +1.'
Explain why the student is wrong.
An atom of oxygen is represented by 816O{}^{16}_{8}\mathrm{O}816O.
Give the relative charge of the nucleus of this atom.
Calculate the fraction of the mass of the oxygen atom that is due to its electrons.
Give your answer in standard form.