An atom of 37Li{}^{7}_{3}\mathrm{Li}37Li loses two electrons. An electron has relative mass 11840\displaystyle \frac{1}{1840}18401 and relative charge -1.
Which gives the change in relative mass and the change in relative charge of the atom?
Mass decreases by 222; charge decreases by 222.
Mass decreases by 21840\frac{2}{1840}18402; charge increases by 222.
Mass decreases by 222; charge increases by 222.
Mass decreases by 21840\frac{2}{1840}18402; charge decreases by 222.
103 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.