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COMEDK2023ChemistryStructure of Atom

Bohr's radius of 2 nd orbit of Be ³⁺ is equal to that of

Options

  1. A4th orbit of hydrogen
  2. B2nd orbit of He ⁺
  3. C3 rd obit of Li ²⁺
  4. D1st orbit of hydrogen

Correct answer

D. 1st orbit of hydrogen

Step-by-step solution

Bohr radius for n th orbit =0.53 Å n^2 Z where, Z= atomic number Bohr radius of 2 nd orbit of Be ³⁺= 0.53 (2)^3 4 =0.53 Å For option (d) Bohr radius of 1st orbit of H = 0.53 (1)^3 1 =0.53 Å Hence, Bohr's radius of 2 nd orbit of Be ³⁺ is equal to that of first orbit of hydrogen.

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