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Formation and Properties of Metallic Bonds
Terms in this set (18)
Metallic Bonds are formed between
8-12 metal atoms
Metals give away electrons therefore,
when only metals bond they do not have other atoms to receive electrons.
Attraction of metallic cation to delocalized electrons
Metallic Bonds form
"A Sea of Electrons"
A Sea of Electrons
-When a metal loses electrons it leaves behind a positive ion that gets anchored.
-Electrons are free flowing and are not anchored to any positive ion. The electrons wander through the crystal.
Electrons that are not held to any one cation and move easily throughout the crystal.
Metallic Bonds have High Electrical Conductivity
Electrons are mobile enough to pass heat and electricity throughout.
Metals are 100x greater in conductivity than nonmetals.
Metallic Bonds have High Thermal Conductivity
Heat is carried through metals by collisions between electrons.
The ability to be pulled into wires.
The ability to be hammered out into sheets.
The electrons act like
A flexible glue holding atomic nuclei together allowing electrons to push and pull pass each other.
The reflection of light off the metal.
Luster Properties and Effects
-The free electrons can absorb photons in the "sea", so metals are opaque-looking.
-Electrons on the surface can bounce back light at the same frequency that the light hits the surface, therefore the metal appears to be shiny.
Metallic Bonds are insoluble in water
-No metals dissolve in water.
-Electrons can't go into the solution.
-Liquid mercury will dissolve metals forming Amalgams.
Metallic Bonds have high boiling and melting points
-Melting points range form -39 degrees Celsius to 3410 degrees Celsius.
-Variation corresponds with the strength of metallic bonds. [The more valence electrons, the stronger the bond]
The ability to withstand breaking apart.
Metallic Bonds are durable
Cations are stationary and mobile electrons are strongly attracted and not easily removed.
Hardness in Metallic Bonds
Transition metals are hardest because the mobile electrons consist of outer "s" and inner "d" as delocalized electrons.
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