AQA GCSE Combined Science Trilogy · 8464
Specification 5.4.1.2, 6.4.1.2 · Paper 3, Paper 5
An atom or group of atoms with a positive electrical charge. A metal atom forms a positive ion by losing electrons.
Revise: The Reactivity SeriesWhen a metal reacts, its atoms lose electrons and form positive ions, also called cations. Losing negative charge leaves the ion with more protons than electrons.
- Revise: Atomic Number, Mass Number and Isotopes
A particle formed when an atom loses one or more electrons, leaving more protons than electrons.