How would the ionization energy change when electron in hydrogen atom is replaced by a particle of mass 200 times that of the electron but having the same charge.

Dear student,

When the electron in the hydrogen atom is replaced by particle of mass 200 time that of electron, atomic radius decreases. When the atomic radii decrease,higher is the atomic energy.The ionizations energy increases with decrease in size.Because the valence electron are tightly held and more energy is required to remove it.

Regards.
 

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Ionisation energy is the minimum amount of energy required to remove an electron from the outermost orbit of a neutral atom in it's ground state.
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