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Q.

A hydrogen-like atom 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

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answer is 5.

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Detailed Solution

E=13.6Z2n2According to question, ​13.6Z24−13.6Z29=47.2⇒13.6Z2(536)=47.2​⇒Z2=25⇒Z=5
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A hydrogen-like atom 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