Key term for AQA GCSE Chemistry, used in Atomic Model and Isotopes.
The total number of protons and neutrons in a nucleus, used as the isotope mass value in standard GCSE calculations.
Mass number appears in AQA GCSE Chemistry revision content for Atomic structure and the periodic table, especially Atomic Model and Isotopes and Relative Atomic Mass.
Atomic structure and the periodic table
Atomic Model and Isotopes • Relative Atomic Mass
Key ideas
Fundamental Principles • Core Chemical Concepts
Atomic structure and the periodic table
Atomic Model and Isotopes • Atomic Size and Mass
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