Key term for Edexcel GCSE Chemistry, used in Atomic Structure.
The mass of a subatomic particle compared to other subatomic particles, standardised against 1/12th of the mass of a carbon-12 atom.
Relative mass appears in Edexcel GCSE Chemistry revision content for Key Concepts in Chemistry, especially Atomic Structure and Mass of an Atom.
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Key Concepts in Chemistry
Atomic Structure • Relative Charge and Mass
