Chemistry GCSE
Mass Number
What Mass Number means in Chemistry GCSE, as defined for OCR.
Definition of Mass Number
The total number of protons and neutrons in the nucleus of an atom.
Topics that use Mass Number
- Topic C1: Particles (OCR GCSE)
Related terms
Using Mass Number in the exam
Definition questions usually carry one or two marks, and examiners look for the precise wording. Write the definition from memory, check it against the version above, and then use the term in a longer answer on the same topic so it sticks.
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