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10th Class Science Sample Paper Science Olympiad Model Test Paper-1

  • question_answer
    The atomic number of an elements X is 8 and that of elements Y is 12. Write down the symbols of the ions you would expect to be formed from their atoms.

    A) \[{{X}^{2-}},{{Y}^{2+}}\]   

    B) \[{{X}^{2+}},{{Y}^{2-}}\]

    C) \[{{X}^{2-}},{{Y}^{2-}}\]     

    D) \[{{X}^{2+}},{{Y}^{2+}}\]

    E) None of these

    Correct Answer: A

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