Which of the following have highest energy of electron?
1H1
1H2
1H3
All have equal energy
A
1H3
B
1H1
C
1H2
D
All have equal energy
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Solution
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In a nut shell, you have this thumb rule : Greater the mass of hydrogen isotopes, lesser will be the orbital radius of the corresponding electron more will be it's +I character, and lesser will be its energy.
Thus, least mass will be that of protium and so the electron in protium will be most energetic.
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