Chemistry A-Level
charge and electron number
What charge and electron number means in Chemistry A-Level, as defined for AQA.
Definition of charge and electron number
Check what you remember
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Reference: AQA
Electrons equal protons minus the charge, so subtracting the signed charge handles both a 2⁺ ion that has lost two electrons and a 1⁻ ion that has gained one.
Topics that use charge and electron number
- Mass number and isotopes (AQA A-Level)
Related terms
- abundance ratios
- acceleration to constant kinetic energy
- atomic number
- base peak
- carbon-13 satellite
- detection and current
- flight time and mass
- identical chemical properties
Using charge and electron number in the exam
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