Use words from the box to complete the sentences below about ion formation.
| inner | gaining | losing | outer | sharing |
Atoms can form negative ions by .................... electrons.
These incoming electrons are added to the .................... shell of the atom.
81 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.