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

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

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Question 22
a.

Define the term isotopes in terms of subatomic particles.

[2]
b.

Element Z\text{Z}Z has two stable isotopes. Their mass numbers are 107107107 and 109109109.

The percentage abundance of each isotope is:

  • 28%28\%28% of 107Z{}^{107}\text{Z}107Z
  • 72%72\%72% of 109Z{}^{109}\text{Z}109Z

Estimate the relative atomic mass of element Z\text{Z}Z by selecting one of the following ranges:

  • Less than 107.5107.5107.5
  • Between 107.5107.5107.5 and 108.0108.0108.0
  • Between 108.0108.0108.0 and 108.5108.5108.5
  • Greater than 108.5108.5108.5
[3]
c.

Rutherford's alpha particle scattering experiment provided key evidence that disproved the 'plum pudding' model of the atom. Explain how the results of this gold foil experiment led to the proposal of the nuclear model of the atom.

[2]
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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

41 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1 Atoms, elements and compounds, 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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