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AP EAMCET202119 Aug 2021Morning ShiftChemistryStructure of AtomActual

On the basis of Bohr's model, the radius of the 3 rd orbit is

Options

  1. AEqual to the radius of 1 st  orbit
  2. B3 times the radius of 1 st  orbit
  3. C5 times the radius of 1 st  orbit
  4. D9 times the radius of 1 st  orbit

Correct answer

D. 9 times the radius of 1 st  orbit

Step-by-step solution

So we know the concept of bohr's orbital theory the radius of n th orbit is r   =   0 . 53   n 2 z Where we know that n = Number of orbit z   = atomic number So for 3 rd orbit the radius is r   =   0 . 53 × 9 z So from above we know that 3 rd orbit radius is 9 times the radius of 1 st orbit

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