A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

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Question 33
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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.

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A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

  1. GCSE
  2. /Chemistry
  3. /A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes