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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 25

A sample of a newly discovered heavy element, Astroium (As\text{As}As), is recovered from a meteorite and analyzed using a mass spectrometer.

The mass numbers and percentage abundances of the three isotopes found in the sample are shown in the table below:

IsotopeMass numberPercentage abundance (%)
191As^{191}\text{As}191As19128.5
193As^{193}\text{As}193As19351.2
194As^{194}\text{As}194As19420.3

Calculate the relative atomic mass (ArA_rAr​) of Astroium in this sample.

Give your answer to 2 decimal places.

[3]
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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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