Chemical Bonding And Molecular Structure Question 293

Question: Two elements X and Y have following electronic Configurations

$ X:1s^{2},2s^{2},2p^{2},3s^{2},3p^{6}4s^{2} $ $ Y:1s^{2},2s^{2},2p^{6},3s^{2},3p^{5} $ The expected compound formed by combination of X and Y will be expressed as

Options:

A) $ XY_2 $

B) $ X_5Y_2 $

C) $ X_2Y_5 $

D) $ {X_{{}}}Y_5 $

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Answer:

Correct Answer: A

Solution:

  • Valency of element X is 2 (electrons in the outermost shell) while that of element Y is 1 (electron required in the outermost shell to complete octet). So, the formula of the compound between X and Y is $ XY_2 $


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