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A hydrogen-like atom has one electron re...

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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The correct Answer is:
5
`DeltaE_(2rarr3)=4.7eV" "rArr" "13.6Z^(2)((1)/(4)-(1)/(9))=47.2" "rArr" "Z^(2)=(47.2)/(13.6)xx(36)/(5)`
`rArr" "Z^(2)=25" "rArr" "Z=5`
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