Metallic Bonds and Metallic Properties The valence electrons of metal atoms can be modeled as a sea of electrons. The valence electrons are mobile and can drift freely from one part of the metal to another. Metallic bonds consist of the attraction between the free-floating valence
electrons and the positively charged metal ions. Occur between ions of the same metal or different metals. https://www.youtube.com/watch?v=vOuFTuvf4qk Metallic Bonding Sea of electrons - regular array of cations
surrounded by its valence electrons Metal Structure Model: Atoms form a nonrigid crystal structure to best use available space. Metallic Bonds and Metallic Properties A force can change the shape of a metal. Ions and free floating electrons rearrange their
structure. Metallic Bonds and Metallic Properties 1.Metals are malleable (can be pounded into another
shape). Conversely, a force can shatter an ionic crystal. Metallic Bonds and Metallic Properties Metals are ductile can
be made into wires. Metallic Bonds and Metallic Properties Metals can conduct an electric current as a solid. Metal Alloys Alloys are mixtures of two or more elements, at least one of which is a metal.
Alloys are important because their properties are often superior to those of the individual elements. Metal alloys Metals melted together to make a solution (homogeneous solid!!) - 2 types Substitutional Alloy some of the host metal atoms are replaced by other metal atoms of similar size.
Interstitial Alloy some of the holes in the closest packed metal structure are occupied by small atoms. https://www.youtube.com/watch? v=9LHDSB1n11k Metal Alloys Substitutional Alloy: Alloy
some metal atoms replaced by others of similar size. More (or less) malleable, more corrosion resistant Metal Alloys Interstitial Alloy:
Interstices (holes) in closest packed metal structure are occupied by small atoms. Harder, stronger, less ductile Metal alloys graphics
Which is a substitutional alloy? Which is an interstitial alloy? Alloys The most important alloys today are steels because they have a wide range of useful properties, such as corrosion resistance, ductility, hardness,
and toughness. Other Important Alloys Pewter (tin, silver, antimony, bismuth) Bronze (copper and tin) (Allowed ancient people in the Bronze Age to build
stronger, more durable tools) Sterling silver (silver, copper) Alloys In 1812, Napoleon tried to invade Russia.
All soldiers had shiny tin buttons. In the Siberian cold, the tin disintegrated in to a fine powder. Uniforms and boots would not stay closed.
Exploring electronic signature process similar to under 30 kw solar NEM Portal . SCE: Under review, but SCE may use Docusign. SDG&E: accepts electronic signatures and NEM terms and conditions are set up in DIIS for electronic acceptance. ... inverters...
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Progressive Metamorphism Reading: Winter, Chapter 21 Low Grade Barrovian Zones Chlorite zone. Pelitic rocks are slates or phyllites and typically contain chlorite, muscovite, quartz and albite Biotite zone.
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