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Question

A hydrogen - like atoms has one electron revolving around a stationary nucleus. The energy required to excite the electron from the second orbit to the third orbit is 47.2 eV. The atomic number of the atom is:

A
3
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B
4
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C
5
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D
6
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Solution

The correct option is C 5
According to the question, 47.2=13.6Z2(122132)
Solving we get z=5.

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