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How much energy is required to ionize a hydrogen atom containing an electron in the n=2 level

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User Mark VY
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Answer: The energy required to ionize a hydrogen atom containing an electron in the n=2 level is approximately 13.6 eV or 136000 MHz. This is known as the second ionization energy of hydrogen and it increases with each higher energy level.

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User Knute Knudsen
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