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Question

The energy associated with the first orbit in the hydrogen atom is –2.18 × 1018 J atom1 . What is the energy associated with the fifth orbit?

Calculate the radius of Bohr’s fifth orbit for hydrogen atom.

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Solution

Energy associated with the fifth orbit of hydrogen atom is calculated as:
E5=(2.18×1018)(5)2=2.18×101825E5=8.72×1020J

Radius of Bohr’s nth orbit for hydrogen atom is given by, rn=(0.0529nm)n2
For, n = 5
r5=(0.0529nm) (5)2
r5=1.3225nm


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