An atom is neutral at first. The atom then emits electromagnetic radiation. Later, some outer electrons are removed from the atom, and it is left with an overall relative charge of +2.
An electron has relative mass 11840\displaystyle \frac{1}{1840}18401 and relative charge -1.
Explain whether the emission of electromagnetic radiation changes the number of electrons in the atom.
Calculate the change in the relative mass of the atom.
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.