Multiple choice

There are two isotopes of hydrogen, i.e. 1H and 2H. The ratio of radii of their first orbits, using Bohr's Theory and ignoring the reduced mass concept, is

  1. 1 : 2

  2. 1 : 1

  3. 1 : 4

  4. none of the above
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B Correct answer
Explanation

In both the isotopes, the number of protons is 1. Only the number of neutrons varies. If the reduced mass concept is not taken into account, then the radius would only depend on the central charge and not on the mass. Hence, these isotopes have the same atomic radii, although this is factually incorrect. Reduced mass concept holds in reality.

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