Physics GCSE
Atomic number and mass number
What Atomic number and mass number means in Physics GCSE, as defined for OCR.
Definition of Atomic number and mass number
Check what you remember
Read the wording for your board, then hide it and explain Atomic number and mass number in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
The subscript Z is the atomic number and the superscript A is the mass number, which counts protons plus neutrons.
Topics that use Atomic number and mass number
- Radioactive emissions (OCR GCSE)
Related terms
- Absorbing materials
- Alpha emission
- Beta emission
- conservation of charge
- conservation of mass number
- Conventional nuclear notation
- Electron energy levels
- Emission and absorption of electromagnetic radiation
Using Atomic number and mass number in the exam
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