Chapter 7 & 8 - Atomic Structure and Periodicity_Part2

Chapter 7 & 8 - Atomic Structure and...

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GENERAL CHEMISTRY CHAPTERS 7 & 8 - ATOMIC STRUCTURE AND PERIODICITY P AGE 6 OF 28 Emission Spectra of Atoms Newton showed that sunlight is composed of various color components that can be recombined to produce white light = consists of an essentially continuous distribution of wavelengths spanning the entire region of the electromagnetic spectrum When a narrow beam of white light is passed through a glass prism, the different wavelengths travel through the glass at different rates As a result, white light is separated into its component colors Red Orange Yellow Green Blue Violet White light produces a continuous emission spectra Includes all wavelengths of light The emission spectrum of a substance can be seen by energizing a sample with thermal energy (heat) or another form of energy (electric) Example : A “red hot” iron bar removed from a high-temperature source produces a glow The visible glow is the portion of the emission spectrum that is sensed by the eye The warmth of the bar represents another portion of the emission spectrum – the infrared region Unlike white light, the light (and heat) given off by an excited atom is NOT a continuous emission spectra Specific lines are produced = line emission spectra Line spectra = light emission only at specific wavelengths When passed through a narrow slit and then through a prism, the light emitted by an excited atom consists only of a few wavelengths (not a rainbow of colors) on a dark background
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GENERAL CHEMISTRY CHAPTERS 7 & 8 - ATOMIC STRUCTURE AND PERIODICITY P AGE 7 OF 28 Every element has a unique emission spectrum
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