JEE Main & Advanced Chemistry The s-Block Elements Question Bank Critical Thinking

  • question_answer The number of electron and proton in the third alkaline earth metal ion will be [MP PET 2003]

    A) \[\frac{e}{20},\,\,\frac{p}{20}\]

    B) \[\frac{e}{18},\,\,\frac{p}{20}\]

    C) \[\frac{e}{18},\,\,\frac{p}{18}\]

    D) \[\frac{e}{19},\,\,\frac{p}{20}\]

    Correct Answer: D

    Solution :

    Third alkaline earth metal is calcium \[_{20}C{{a}^{40}}\]. No. of electron are 20 & No. of proton are 20; e/20, p/20.


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