Mass Number (A)

Key term for OCR GCSE Chemistry B, used in History of the atomic model.

Definition

The total combined number of protons and neutrons inside the nucleus of an atom.

Exam Context

Mass Number (A) appears in OCR GCSE Chemistry B revision content for Chemical patterns, especially History of the atomic model and Sub-atomic particles.

Chemical patterns History of the atomic model Sub-atomic particles

Found in Revision Notes

Chemical patterns

Sub-atomic particles

History of the atomic model • Sub-atomic particles

Revise note

Related Key Terms

Atomic Number (Z)Electrons Ion Isotopes

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