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

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Question 14
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The discovery of isotopes explained why some relative atomic masses are not whole numbers.

Element X has two isotopes.

The table below shows the mass numbers and percentage abundances of the isotopes of element X.

Mass numberPercentage abundance (%)
1019.9
1180.1

Calculate the relative atomic mass (ArA_rAr​) of element X.

Give your answer to 1 decimal place.

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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