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JAMB Chemistry 1991 Question 9

Question 9

Atomic Structure

Atoms of element X (with 2 electrons in the outer shell) combine with atoms of Y (with 7 electrons in the outer shell). Which of the following statements is FALSE? The compound formed

  1. A.has formula XY
  2. B.is likely to be ionic
  3. C.contains X2+ ions
  4. D.contains Y− ions.
Show the answer and explanation

Answer: A (has formula XY)

Explanation

X loses 2 electrons to form X2+ and each Y gains 1 to form Y−, so the formula is XY2, not XY.