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GCSE Physics · key term
A positively charged ion formed when an atom loses one or more electrons.
Used by AQA and Edexcel
Specification 4.4.1.2 · Paper 1
Revise: Mass number, atomic number and isotopesAn atom becomes a positive ion when it loses one or more outer electrons. Protons remain in the nucleus, so removing negatively charged electrons leaves an excess of positive charge.
Specification 10.24 · Paper 2
A positively charged particle; in a metal, positive ions occupy fixed positions in a lattice but can vibrate.
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A metal consists of a closely packed lattice of positive ions, surrounded by electrons that can move through the material. The ions remain in their lattice positions, although they vibrate about those positions.