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[" An electron revolves round a nucleus of charge "Ze." In "],[" order to excite the electron from the state "n,=2" to "],[n=3," the energy required is "47.2" eV."Z" is equal to "],[[" (a) "3," (b) "4," (c) "5" .(c) "5," (d) "2],[" As per Robring the "," (c) "5," (d) "2]]

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