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Energy of an electron in the nth orbit o...

Energy of an electron in the nth orbit of hydrogen atom is given by E,- ev. How much energy is required to take an electron from the ground state to the first excited state?

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In hydrogne atoms ground state correponds to n = 1 and the first excited state corresponds to n = 2. Hence , energy required .
`E = E_(2) - E_(1) = (-13.6)/((2)^(2)) -[(-13.6)/((1)^(2))] = - 3.4+13.6 = +10.2 eV`
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