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The minimum energy required to excite a ...

The minimum energy required to excite a hydrogen atom from its ground state is ______.

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10.2 eV.[Minimun energy required [` E = E_(2) - E_(1) = - (13.6)/((2)^(2)) - (13.6)/((1)^(2)) = - 3.4 + 13.6 = + 10.2eV`].
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