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Each element has a unique atomic spectrum. If a gas is placed in a tube and then an electric current is passed into the tube, the gas will emit light. The light emitted by each gas is different and is a characteristic of the gas. Light emitted in the form of a line spectrum.
Spectrum lines forming a row of colored light with different wavelengths. For hydrogen gas which is the simplest atom, the wavelength of this series turned out to have a certain pattern that can be expressed in terms of mathematical equations.

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