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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 6
F

Element Q has two isotopes. The table gives information about these two isotopes.

Table: The mass numbers and the percentage abundances of the two isotopes of element Q

IsotopeMass numberAbundance (%)
Q-6\text{Q-6}Q-667.5
Q-7\text{Q-7}Q-7792.5
a.

State what is meant by isotopes.

[2]
b.

Calculate the relative atomic mass of element Q. Give your answer to one decimal place.

[2]
c.

Explain why the relative atomic mass of element Q is not a whole number.

[1]
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

40 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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