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1.2 Atomic structure

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Question 18

Three atoms are represented below. The letters are not the chemical symbols of the elements.

1840Q{}^{40}_{18}\mathrm{Q}1840​Q 2040R{}^{40}_{20}\mathrm{R}2040​R 2044T{}^{44}_{20}\mathrm{T}2044​T

Explain which two of these atoms are isotopes of the same element.

[3]
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1.2 Atomic structure Questions

  1. GCSE
  2. /Chemistry
  3. /1.2 Atomic structure

101 exam-style questions on OCR GCSE Chemistry 1.2 Atomic structure, covering 1.2.1 Development of the atomic model, 1.2.2 The nuclear model and the size of atoms, and 1.2.3 Subatomic particles in atoms and ions. Each one has a worked solution and a mark scheme showing where the marks go.

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