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An element X has two isotopes, \(^{20} _{10}X\) and \(^{22} _{10}X\), present in the ratio 1:3....

Chemistry
JAMB 1982

An element X has two isotopes, \(^{20} _{10}X\) and \(^{22} _{10}X\),
present in the ratio 1:3. The relative atomic mass of X would be?

  • A. 20.5
  • B. 21.0
  • C. 21.5
  • D. 22.0
  • E. 22.5
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Correct Answer: Option C
Explanation

The relative atomic mass will be [(20 * 1) + (3 * 22)] / (4)
(86)/(4) = (43)/(2) = 21.5

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