Why is the line spectrum of an element known as the fingerprint of its atoms?

The spectrum of an atom is known as

Why line spectra is regarded as the fingerprints of atoms ?

Why line spectra is regarded as the fingerprints of atoms ?

Why line spectra is regarded as the fingerprints of atoms ?

The line spectrum of two elements is not identical because

The line spectrum of two elements is not identical because :

The study of emission line spectra of a material serve as a fingerprint for identification of the gas. Name different series of lines observed in hydro gen spectrum.

Why is the atomic number of an element more important than its atomic mass in the context of its properties ?

Combination of atoms of same elements is known as