define emission spectrum and spectroscopy.
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★ SPECTROSCOPY:
→ The study of emission of absorption spectra is called spectroscopy.
★ Atomic spectra or line spectra:
→ The emission spectra of atoms in a gas emit only at specific wavelength as bright lines with dark spaces between them is called line spectra or atomic spectra.
★ Importance of line emission spectra:
→ Used to study electronic structure. Each element has unique line emission spectrum.
→ Line spectra can be used in chemical analysis to identify unknown atoms.
→ Scientist used line spectra to identify elements like Robert Bunsen.
→ Elements discovered by using spectroscopic method are Rubidium (Rb), Caesium (Cs), Thallium (TI)
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