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Metallic Bonds Chemistry Mrs. Coyle
Cations packed in “a sea of electrons”
Metals Metals consist of closely packed cations floating in a “sea of electrons”. All of the atoms are able to share the electrons. The electrons are not bound to individual atoms.
Properties of Metals Good conductors Ductile MalleableElectrons act as a lubricant, allowing cations to move past each other
Metals have a Crystalline StructurePacked spheres of the same size and shape: Body Centered Cubic Face Centered Cubic Hexagonal Close Packed
Body Centered Cubic Chromium
Face-Centered Cubic Gold
Alloys Mixtures of two or more elements, at least one of which is a metal. Made by melting, mixing, then cooling the metals. May contain non-metals like carbon.
Alloys Properties are superior to their components. Sterling silver92.5% Ag, 7.5% Cu Harder than silver Bronze 7:1 Cu to Sn (tin)
Alloys Stainless Steel Fe 80.6%, Cr 18%, C 0.4%, Ni 1%Cast Iron -Fe 96%, C 4%
Substitutional alloysTypes of Alloys Two types of formation: Substitutional alloys Similar size atoms – replacement Interstitial alloys Different size atoms – smaller ions fill interstices (spaces between atoms)
Why is a metal ductile but an ionic compound is not?
Bonding in Metals Section 15.3
Bonding in Metals OBJECTIVES:
Chapter 7 Ionic and Metallic Bonding
Chapter 15 Ionic Bonding and Ionic Compounds
Ions and Ionic Compounds l OBJECTIVES: –Determine the number of valence electrons in an atom of a representative element.
Chapter 7 “Ionic and Metallic Bonding”
Chapter 7: Ionic and Metallic Bonding Section 3: Bonding in Metals.
Chapter 7 “Ionic and Metallic Bonding”. Metallic Bonds are… l How metal atoms are held together in the solid. l Metals hold on to their valence electrons.
Metallic Bonding Strong forces of attraction are responsible for the high melting point of most metals.
Metallic Bonds and Metallic Properties
Chapter 7 Ionic and Metallic Bonding 7.3 Bonding in Metals 7.1 Ions
Bonding in Metals Section 7.3. Objectives When you complete this presentation, you will be able to … Model the valence electrons of metal atoms.
Chapter 7 Ionic and Metallic Bonding Section 7.1 Ions.
Section 7.3. Understanding Metal Atoms The behavior of a metal can be better explained if we understand that it is actually a collection of cations, rather.
I. Metallic Bonds How atoms are held together in the solid form. Metals hold onto their valence electrons very weakly. Think of them as positive.
Chapter 15 Ionic Bonding and Ionic Compounds Walla Walla High School Mr. Carlsen.
7.4 Metallic Bonds and the Properties of Metals
Metallic Bonds and Properties of Metals. Metals Metals are made up of closely packed cations surrounded by electrons, rather than neutral atoms or ions.
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