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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 17
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Bromine contains two isotopes, bromine-79 and bromine-81. A student assumes that the isotopes are equally abundant and calculates a relative atomic mass of 80.0. A data book gives the relative atomic mass of bromine as 79.9.

Why is the value in the data book lower than the student's calculated value?

[1]
A

The lighter isotope always counts for more in a weighted mean

B

Bromine-81 atoms are slightly more abundant than bromine-79 atoms

C

The mass of the electrons lowers the mean mass of the atoms slightly

D

Bromine-79 atoms are slightly more abundant than bromine-81 atoms

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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