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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 21

In 1897, J. J. Thomson discovered the electron. Two students suggest how scientists should have changed their ideas about atoms after this discovery.

Student A: 'Electrons are separate particles found between atoms, so the model of the atom used before 1897 does not need to change.'

Student B: 'Electrons are found inside atoms, so atoms must also contain positive charge.'

Explain why the model of the atom used before 1897 had to change, and why Student B is correct that atoms must also contain positive charge.

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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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