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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 3
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A sample of an element is analysed and found to contain only two isotopes. One quarter of the atoms in the sample have a mass number of 78. The other three quarters have a mass number of 80. What is the relative atomic mass of the element in this sample?

[1]
A

79.0

B

78.5

C

80.0

D

79.5

Markscheme

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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