JAMB Chemistry 2017 Objective — Question 8
Question 8 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2017 Objective paper, with the correct answer and a full explanation.
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If Y = 1s²2s²2p⁴ and X = 1s²2s²2p⁶3s², the chemical formula of the likely compound formed between X and Y is
- A. A. X2Y
- B. B. XY2
- C. C. XYCorrect
- D. D. X2Y3
Explanation
Y needs 2 electrons to complete its octet (combining power 2); X loses 2 electrons to attain octet (combining power 2). Equal combining powers of 2 give the simplest formula XY.
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