JEE Main & Advanced
Physics
Atomic Physics
Question Bank
Atomic Structure
question_answer
As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is [IIT 1997 Re-Exam; MH CET 2000]
A) 1.51
B) 13.6
C) 40.8
D) 122.4
Correct Answer:
D
Solution :
\[E=-{{Z}^{2}}\times 13.6\ eV\]\[=-9\times 13.6\ eV=-122.4\ eV\] So ionisation energy = + 122.4 eV.