MIME 260 Lecture 4: Lecture 3 Mime 260 Ch3_A Metals_xtal struct -19 updated
14 Feb 2019
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Chapter 3 metals part a: metallic bonding & general attributes of metals 3, crystal structure. 8: metallic crystal structures 12, theoretical density of metals 25, polymorphism & allotropy, crystal lattice points, directions, planes. 88 elements to the left of the stair-step line are metals or metal like elements. Metallic bonding (cid:1) in order for a material to be considered metallic, it must have metallic bonding. Bond is non-directional. (cid:1) at any point in time, there are electrons around the atom core, equal in number to the number of valence electrons to maintain a neutral charge positive. Sea of valence electrons (delocalized electron cloud) commonly shared by all atoms. Ductile (most metals can be drawn out into thin wires) Malleable (most metals can be hammered into thin sheets or drawn into a cup)-formable. Quickly reflect the light energy (photons) they absorb giving rise to characteristic glow (luster)
