A particular hydrogen like atom has its ground state Binding Energy =122.4eV.It is in ground state. Then:
(A) Its atomic number is 3.
(B) An electron of 90 eV can excite it
(C) An electron of kinetic energy 91.8eV can be brought to almost rest by this atom.
(D) An electron of KE nearly 2.6 eV may emerge from the atom when electron of KE 125ev collides with this atom
