What is the purpose of analyzing the line spectra of different elements?

Because each element has characteristic emission and absorption spectra, scientists can use such spectra to analyze the composition of matter. When an atom emits light, it decays to a lower energy state; when an atom absorbs light, it is excited to a higher energy state.

Explanation:

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periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.