Assertion (A) : If the total energy of the electron in a H-atom is negative, then it would be bound to the nucleus.
Reason (R) : Bohr model is valid for both one electron atom and multi-electron atom.
Answer & explanation
Correct answer: option 3
Electron is bound to nucleus by electrostatic force of attraction.
Total energy = K.E + P.E , Its negative means , its kinetic energy is not enough to break free form the orbit.
Bohr model is valid for one electron atom only.