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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 31
a.

State what is meant by the term isotopes in terms of subatomic particles.

[2]
b.

Element X\text{X}X has two naturally occurring isotopes. Their mass numbers are 191191191 and 193193193.

The percentage abundance of each isotope is:

  • 38%38\%38% of 191X{}^{191}\text{X}191X
  • 62%62\%62% of 193X{}^{193}\text{X}193X

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

  • Less than 191.5191.5191.5
  • Between 191.5191.5191.5 and 192.0192.0192.0
  • Between 192.0192.0192.0 and 192.5192.5192.5
  • Greater than 192.5192.5192.5
[2]
c.

In 1911, Rutherford's alpha particle scattering experiment disproved the plum pudding model. Explain how two specific observations from this 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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