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JAMB Chemistry 1982 Question 6

Question 6

Atomic Structure

An element X has two isotopes, 2010X and 2210X, present in the ratio 1:3. The relative atomic mass of X would be

  1. A.20.5
  2. B.21.0
  3. C.21.5
  4. D.22.0
  5. E.22.5
Show the answer and explanation

Answer: C (21.5)

Explanation

Average mass = (1 × 20 + 3 × 22)/4 = 86/4 = 21.5.