The discovery of isotopes explained why some relative atomic masses are not whole numbers. Element R has two isotopes. Table 5 shows the mass numbers and percentage abundances of the isotopes of element R.
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<h3 style="text-align: center; margin-bottom: 5px;">Table 5</h3>
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<th style="border: 1px solid #000; padding: 10px; width: 50%;">Mass number</th>
<th style="border: 1px solid #000; padding: 10px; width: 50%;">Percentage abundance (%)</th>
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<td style="border: 1px solid #000; padding: 10px;">6</td>
<td style="border: 1px solid #000; padding: 10px;">7.6</td>
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<td style="border: 1px solid #000; padding: 10px;">7</td>
<td style="border: 1px solid #000; padding: 10px;">92.4</td>
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Calculate the relative atomic mass (Aᵣ) of element R. <br/><br/>
Give your answer to 1 decimal place.
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