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An element X with electronic configuration \(1S^22S^22P^63S^2\) combines with another element Y with the configuration...

Chemistry
WAEC 2003

An element X with electronic configuration \(1S^22S^22P^63S^2\) combines with another element Y with the configuration \(1S^2S^22P^23S^23P^5\). What is the formula of the compound formed?

  • A. X2Y5
  • B. X2Y3
  • C. XY3
  • D. XY2
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Correct Answer: Option D
Explanation

Element X has a valency of 2 while Y has a valency of 1,

so they exchange valency to form \( XY_2\)

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