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JAMB Chemistry 1989 Question 9

Question 9

Atomic Structure

Elements X and Y have electronic configurations 1s22s22p4 and 1s22s22p63s23p1 respectively. When they combine, the formula of the compound formed is

  1. A.XY
  2. B.YX
  3. C.X2Y3
  4. D.Y2X3.
Show the answer and explanation

Answer: D (Y2X3.)

Explanation

X (oxygen) has valency 2 and Y (aluminium) has valency 3. Exchanging valencies gives Y2X3, like Al2O3.