Question

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 atomic numbers
• C. Their outermost electrons are at different energy levels
• D. They have different valencies

Answer 1

The correct option is C Their outermost electrons are at different energy levels

The line spectra of two elements are not identical because their outermost electrons are at different energy levels and the energy absorbed by the electrons of the two different elements is different.