Physics GCSE
atomic number
What atomic number means in Physics GCSE, as defined for AQA.
Definitions of atomic number
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Reference: AQA
The number of protons in an atom of an element, given the symbol Z, and written as the lower of the two numbers in the nuclide symbol.
The number of protons in an atom, which is the atomic number of the element.
Topics that use atomic number
- Mass number, atomic number and isotopes (AQA GCSE)
Related terms
- counting neutrons
- identity, charge and mass
- ions
- isotopes
- mass number
- neutral atoms
- nuclide notation
- nuclide symbols
Using atomic number in the exam
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