Presentation on theme: "A metallic bond is the attraction of a metallic cation for delocalized electrons. Delocalized electrons are electrons that are free to move around. The."— Presentation transcript:
A metallic bond is the attraction of a metallic cation for delocalized electrons. Delocalized electrons are electrons that are free to move around. The electron sea model proposes that all metal atoms in a metallic solid contribute their valence electrons to form a sea of electrons.
Melting points (vary greatly) Ex:Mercury- liquid at room temp. Tungsten- melting point of 3422˚C Does not take a lot of energy to reach melting point, so atoms can move past each other Takes a lot of energy to boil because atoms are becoming a gas so cations and electrons must separate.
Malleable and ductile (and durable) Metals can be hammered into sheets and drawn into wire cations and electrons Metal is Deformed
Good Conductors o Delocalized electrons are free to move, so they can move heat from one place to another very quickly. o Mobile electrons can move easily in an electrical current when electricity is applied to a metal. o These delocalized electrons also interact with light, absorbing and releasing photons, which gives them luster.
Strength and Hardness o Mobile electrons in transition metals consist of not only two outer s electrons but also inner d electrons. o As the number of delocalized electrons increases so do hardness and strength. Ex: Chromium, iron, and nickel have strong metallic bonds Alkali metals are considered soft because they only have one delocalized electron.