JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties Question Bank Atomic and lonic radii

  • question_answer The ratio between radii of \[H{{e}^{+}}\] ion and H atom is [MP PET 1996]

    A) \[\frac{1}{2}\]

    B) 1

    C) \[\frac{3}{2}\]

    D) 2

    Correct Answer: B

    Solution :

    Value of Z  for hydrogen =1 Value of Z  for helium = 2 Value of n for both is = 1 \[{{r}_{H}}=\frac{0.52\times {{1}^{2}}}{1}\]  \[{{r}_{H{{e}^{+}}}}=\frac{0.52\times {{1}^{2}}}{1}\] \[\frac{{{r}_{H}}}{{{r}_{H{{e}^{+}}}}}=1:1\] or \[{{r}_{H{{e}^{+}}}}:{{r}_{H}}=1:1\]

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