A particular hydrogen like atom has its ground state binding “energy 122.4eV ”. Its is in ground state. Then:

Select all that apply

• Option A

  Its atomic number is 3.

• Option B

  An electron of 90 eV can excite it.

• Option C

  An electron of kinetic energy nearly 91.8 eV can be brought to almost rest by this atom.

• Option D

  An electron of kinetic energy 2.6 eV may emerge from the atom when electron of kinetic energy 125 eV collides with this atom.