ChemistryThe radius of the first orbit is

The radius of the first orbit is

  1. A

    0.529Ao

  2. B

    0.0529 nm

  3. C

    52.9 pm

  4. D

    529 m

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    Solution:

    Radius of nth orbit is given by,

    r=0.529Xn2ZAo

    For H-atom Z = 1 and electron present in 1st orbit, so n=1
    r1=0.529Xn210.529Ao

    1Ao=0.1nm=100pm

    r1=0.529Ao=0.0529nm=52.9pm

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