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

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Question 4

A laboratory reference sample of element T contains atoms of only two isotopes of T. The table shows the mass numbers of these isotopes.

IsotopeMass number
T-2424
T-2626

The relative atomic mass of T in this sample is 24.6.

Calculate the percentage of the atoms in the sample that have a mass number of 26.

[3]
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1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

93 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1a Atoms, elements and compounds, 1.1.1b Half equations and ionic equations, 1.1.2 Mixtures, 1.1.3 The development of the model of the atom (common content with physics), 1.1.4 Relative electrical charges of subatomic particles, 1.1.5 Size and mass of atoms, 1.1.6 Relative atomic mass, and 1.1.7 Electronic structure. Each one has a worked solution and a mark scheme showing where the marks go.

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