Covalent Bonding - Mc Guckin Science

Covalent Bonding - Mc Guckin Science

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.

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