ET 241 : ET 241 Midterm SG
15 Mar 2019
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Document Summary
Introduction, structural materials, and mechanical properties of materials. Appearance, and environment. trends, customer requests, or new ideas. Structure of materials: why material behave differently: different materials are composed of different chemical elements that are the smallest undividable stable substances, chemical elements connect to each other to form the materials in a different manner. Isotopes nucleus with various number of neutrons: atomic mass average weight of all isotopes, energy levels orbits/shells surrounding nucleus, valence outer most layer, same electron/proton; different neutrons. Ionic bonding atoms have few electrons in their nearly complete valence shell. Electrons transferred between atoms: covalent bonding atoms have a hall full valence shell. Electrons are shared between atoms. are shared amongst all the positively charged atoms in a lattice: metallic bonding atoms have only a few electrons in valence shell. Electrons: secondary bonding weal attraction between molecules where no electrons are, only happens to pure metal transferred or shared.
