Q. The line spectra of two elements are not identical because
A) The elements do not have the same number of neutrons
B) They have different mass numbers
C) Their outermost electrons are at different energy levels
D) All of the above
Explanation
The correct answer is Option C: Their outermost electrons are at different energy levels.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.