CHEM101 Chapter Notes -Periodic Trends, Spectrum Range, Atom

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CHEM101 Full Course Notes
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CHEM101 Full Course Notes
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An atom is made of electrons moving around a tiny nucleus, which contains protons and neutrons. No charge (+1) (~2000 x mass of e ) Different atoms different # of e , protons. We will not go into any other subparticles (left for your physics courses). Within a group, elements have similar chemical properties. This is the normal world where everything is relatively large compared with the molecular size. Atomic particles, e , protons and neutrons behave like particles and like waves at the same time. Spectroscopy is the study of interaction of matter with electromagnetic radiation. To understand that need to introduce light in its general form. Wavelength ( ) = distance between two consecutive crests (or troughs). Frequency ( ) = number of wave cycles in a given time. 4 cycles per second = 4 hz = 4 s 1. 8 cycles per second = 8 hz = 8 s 1.

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