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دانلود رایگان bonding دسته بندی : پاورپوینت
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تعداد اسلاید : 73 صفحه
The Chemical Bond Simply put, a chemical bond is the attractive force that holds two atoms together. Chemical bonds always describe the interactions of valence electrons between two adjacent atoms. Different types of interactions result in different types of chemical bonds.
Types of Chemical Bonds: Ionic Metallic Covalent The Ionic Bond Ionic Bonds occur between a metal and a non-metal When two atoms combine by transfer of electrons, ions are produced.
The opposite charges of the ions hold them together.
This electrostatic force, created by electron transfer, is called an ionic bond. Example 2Na + Cl2 ---> 2Na+ + 2Cl- If a chloride ion and a sodium ion are brought together, there will be an attractive force between them.
If the ions are brought almost into contact, the force will be great enough to hold the two ions together.
Ionic Bonding Ionic compounds are formed during the transfer of electrons between many atoms in a solid state. A crystal lattice of regularly organized, repeating pattern of cations and anions forms The effective charge of the compound is zero Ionic Bonding Elements can be assigned oxidation numbers for ionic bonding.
E.g.
Sulfur, with 6 valence electrons, will tend to gain 2 electrons to attain the stable octet configuration.
The oxidation number of sulfur for ionic bonding is 2-.
The negative two is its electric charge after gaining two electrons. Ionic Bonding Ionic compounds are characterized by: high melting points ability to conduct electricity in the molten state high solubility in water ability to crystallize as sharply defined particles Bond Funnies Bond Funnies Metallic Bonding A metallic bond is defined as the attraction of a metallic cation for delocalized electrons.
Electron Sea Model All the metal atoms contribute their valence (outer energy level) electrons to form a “sea of electrons The valence electrons are not held by any specific atom and can move freely from one atom to the next Because they are free to move they are called delocalized electrons Electron Sea Model Alkali metal Alkaline earth metal Metallic Bonding Because the electrons are no longer held to one atom, metallic cations are formed.
Each metal cation is bonded to the other metal cations in the lattice, via the surrounding sea of electrons. A metallic bond is the attraction of a metal cation for delocalized electrons Properties of Metals High electrical conductivity Metals are malleable -they can be hammered into sheets Ductile- the
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