CHM135H1 Chapter Notes - Chapter 5: Azimuthal Quantum Number, Magnetic Quantum Number, Electromagnetic Spectrum
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CHM135H1 Full Course Notes
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Periodic table: graph of atomic radius versus atomic number shows periodic rise and fall pattern. Spectroscopy: the study of the interaction of radiant energy with matter. Electromagnetic radiation: radiant energy (e. g. visible light, infrared radiation, microwaves, radio waves, x rays) Electromagnetic spectrum: all forms of electromagnetic radiation collectively make up the electromagnetic spectrum. Electromagnetic energy is characterized by frequency, wavelength, and amplitude. Frequency (v): the number of wave peaks that pass by a given point per unit time (expressed in hz, s-1) Wavelength ( ): distance from one wave peak to the next. Amplitude: height of the wave, measured from the centre line between peak and trough. Intensity of electromagnetic energy is proportional to the square of the wave amplitude. Effect: irradiating a clean metal surface with light causes electrons to be ejected from the metal; frequency of light used for irradiation must be above some threshold value, different for every metal.