Multiple Choice Questions on The electronic configurations of three elements X Y and Z are X mdash 2 8 Y mdash 2 8 7 and Z mdash ........... for 10th Standard Preparation

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Multiple Choice Questions

The electronic configurations of three elements X Y and Z are X mdash 2 8 Y mdash 2 8 7 and Z mdash ...........

Chemistry Chapter- 3
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    The electronic configurations of three elements X, Y and Z are X — 2, 8: Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

    X is a metal

    Incorrect Answer

    Y is a metal

    Incorrect Answer

    Z is a non-metal

    Incorrect Answer

    Y is a non-metal and Z is a metal

    Correct Answer
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    Explanation:

     Metals have 1 or 2 electrons in their valance shell whereas non-metals have 5-7 valence electrons. Here X has octet configuration so it should be a Noble gas.

    By: santosh
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