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JAMB Chemistry 1997 Question 11

Question 11

Atomic Structure

Two elements, P and Q with atomic numbers 11 and 8 respectively, combine chemically to form the compound PxQy. The respective values of x and y are

  1. A.1 and 1
  2. B.1 and 2
  3. C.2 and 1
  4. D.3 and 1
Show the answer and explanation

Answer: C (2 and 1)

Explanation

P (2,8,1) is sodium, which forms Na+; Q (2,6) is oxygen, which forms O2−. Two Na+ balance one O2−, giving P2Q (Na2O).