CHM135H1 Chapter Notes - Chapter 5: Physical Constant, Principal Quantum Number, Beryllium

• School: UTSG
• Department: Chemistry
• Course: CHM135H1
• Professor: Gilbert Walker, Eugenia Kumacheva, Kristine Quinlan

Document Summary

Chapter 5 periodicity and the electronic structure of atoms. Chapter 5. 1: the nature of radiant energy and the electromagnetic spectrum. Visible light, infrared radiation, microwaves, radio waves, x rays, and etc. are all different forms of electromagnetic radiation or radiant energy; they make up the electromagnetic spectrum. Electromagnetic energy in a vacuum similar to ocean waves travelling through water; electromagnetic energy is characterized by a frequency, a wavelength, and an amplitude. Frequency number of wave peaks that pass by a given point per unit time (expressed in reciprocal seconds, or hertz; 1hz = 1s-1 ) Wavelength distance from one wave peak to next. Amplitude height of wave, measure from center line between peak and trough. Rate of travel of all electromagnetic energy in vacuum is constant; speed of light = 2. 99792458 x. Intensity of electromagnetic energy is proportional to square of wave amplitude. Frequency and wavelength are inversely related; electromagnetic energy with longer wavelength has lower frequency and vice versa.