Question

The line spectrum of two elements is not identical because :

• A. they do not have same number of neutrons
• B. they have dissimilar mass number
• C. they have different energy level schemes
• D. they have different number of valence electrons

Answer 1

Answer: (C)

they have different energy level schemes

A spectrum is an assembly of energy levels in the form of radiations emitted by an atom in its excited state. Every atom gives discontinuous line spectra. Each line in the spectra corresponds to a specific wavelength and it is unique to a given element so no two elements give same pattern of lines in their spectra.