Edexcel GCSE Chemistry · 1CH0
Specification 1.3 · Paper 1, Paper 2
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GCSE Chemistry · key term
The charge of a particle expressed by comparison with the magnitude of the charge on a proton.
Used by Edexcel and OCR
Specification 1.3 · Paper 1, Paper 2
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A comparison between the charge of one particle and the charges of other particles, using simple numbers rather than coulombs.
Revise: Sub-atomic particlesTo compare these particles conveniently, chemists use relative charge and relative mass. These are comparisons, so they do not need units.
Do not confuse charge with mass: an electron has relative charge , but its relative mass is approximately .
Write the sign on relative charges: a proton is , not simply .
Include the signs when giving relative charges: proton , electron .
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