Each line represents a unique wavelength, and the entire thing is unique to that particular element. The first is also called a bright line spectrum and consists of a few brightly colored lines against a dark background. Classical theory was unable to explain the existence of atomic emission spectra, also known as line-emission spectra. This means that the gas is receiving energy carried by the photons of light (as in E=hf). No ads = no money for us = no free stuff for you! Line spectrum can therefore be found in both absorption and emission spectra which are exact opposites of each other. The nucleus Line Spectrum. Planetary nebulae, for example, are the remnants of stars which have gently pushed their outer envelopes outwards into space. The line emission (atomic) spectrum of an element is unique. Emission-line spectra Low-density clouds of gas floating in space will emit emission lines if they are excited by energy from nearby stars. Please do not block ads on this website. An atom consists of a number of negatively charged electrons bound to a nucleus containing an equal number of positively charged protons. Line emission spectra (atomic spectra) can be used to identify the presence of an element in a sample because no two elements produce the same line emission (atomic) spectrum. It is a sequence of lines of different color/frequency that represents a kind of "photograph" of the structure of an atom. Spectroscopy is the study of emission and absorption spectra. (a) When an electric discharge is passed through hydrogen gas at low pressure, a bluish light is emitted. Examples Line emission spectrum of H violet n6-n2 blue ng-> nz green n4 n2 Yed ng n2 Calculate the energy of the light emitted when an e- from n=4 to n= 2 goe What is the wavelength of this light ? Unlike visible light which shows a continuous spectrum of all wavelengths, the emission spectra of atoms in the gas phase emit light only at specific wavelengths with dark spaces between them. (b) This light shows discontinuous line spectrum of several isolated sharp lines through prism. The emission of photons through electronic relaxations in atoms produces a line emission spectrum. Every element has a unique atomic emission spectrum, as shown by the examples of helium $$\left( \ce{He} \right)$$ and iron $$\left( \ce{Fe} \right)$$. Take for example an element, which will be named X. Other articles where Line spectrum is discussed: spectroscopy: Basic atomic structure: The emission and absorption spectra of the elements depend on the electronic structure of the atom. This emission occurs when an atom, element or molecule in an excited state returns to a configuration of lower energy. Truly white light, like that emitted by some stars and moons is a perfect example of continuous spectrum. When an absorption spectrum and emission spectrum are combined, you get a continuous spectrum with all the wavelengths. 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