Learning objective

Explain why relative atomic mass is often not a whole number.

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Topic

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

Subtopic

Relative atomic mass

AQA GCSE ChemistryAtomic structure and the periodic table

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Understand this objective

Short explanation

Explain why relative atomic mass is often not a whole number. This objective belongs to Relative atomic mass within A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes for AQA GCSE Chemistry 8462. A strong answer should use relative atomic mass accurately, explain the chemistry behind the statement, and connect the idea back to the exact command in the objective. When revising, separate this point from neighbouring Chemistry ideas by naming the relevant particle, substance, process, calculation, observation, or structure before giving the final conclusion.

Key concepts

relative atomic massisotope

Why it matters

This objective helps connect Relative atomic mass to exam-style questions, flashcards, and revision notes for A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes.

Common mistakes

1 linked

Understanding Relative Atomic Mass: Explain that relative atomic mass is a weighted average of the masses of isotopes, which can result in non-whole number values due to the presence of different isotopes and their relative abundances. Keep the correction anchored to Relative atomic mass and avoid mixing it with nearby Unit 4.1 ideas.

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